I second MrsD about the B-12. You need to know your numbers. Your B-12 should be about 1000 pgs/mL. You should also check your folate and Vit D. Folate should be 20 or above.

The purpose of the B-50 complex is to get the other B's. Just B-12 will not give you maximum benefit. You also need B-6 and thiamine (B-1) plus all the other B's. A good multivitamin like GNC MegaMen will also add the others supplements your body and brain needs. Any strain on the body creates a strain on the brain. The various minerals, especially the trace minerals are needed. Check the total niacin (B-1) in the B-50 and multi. You probably need about 500 mgs per day. A strong dose of all the anti-oxidants is beneficial.

I use the cheap pill form of B-12. I take enough to keep my B-12 level at 1000 even if I am not fully absorbing the form I am taking. If I took sublingual drops, the extra step in my routine would likely cause my consistency to falter. I take 380 mcgs and my blood level is good. Who cares if I am only absorbing 100 mcgs of the 380 mcgs I take.

B-12 and folic acid help the blood brain barrier function properly. It takes about 2 months of a consistent nutritional regimen to begin to see a difference. The brain has to detoxify first before it can start to use the additional nutrition.

I have been taking tumeric extract for the past 2 months and it appears to be making a difference. It has cumin to help the brain's oxygenation and metabolism. I used to have body twitches when I sleep and they have stopped.

Regarding your stomach, there are a few areas in the lower neck/upper back that can get messed up and cause stomach/esophagus problems. I had esophageal spasms and acid reflux the was resolved by a chiropractic adjustment to C-6 to T-2 area. The first adjustment resulted in relief within a few hours. I needed to continue treatment for a while to help the joint stabilize. I also get some relief by icing the upper back. My back never hurt but sometimes felt a bit stiff. The chiro found the problem using 'leg check' diagnostics. Once he worked his magic, voila. Much better.

Some musical instruments cause a postural strain that can become chronic. You may have other activities that put a strain on your spine. The head bump may have strained your back/neck. The head bone IS connected to the neck bone as the song goes. Injured the head and don't forget about the neck connection.

The anxiety issue mentioned by luduplo is valid. Many neurological dysfunctions cause anxiety like processes in the brain. This anxiety is not a psychological 'worry wort' anxiety but rather a malfunction is the way the brain is processing stimuli. The sensitivity to stimuli is due to the brain not being able to shut out or ignore stimuli that a normal brain can easily filer out.

You said you symptoms are:
<I have been experiencing progressively worsening neurological symptoms in addition to some other issues like heart palpitations, frequent urination, and a constantly rapid pulse. >

This can be anxiety as the brain tries to deal with too much stimulation. It enters a flight or fight phase and pays extra attention to body sensation. It releases adrenal hormones that cause this over-stimulation.

I can not go to sleep if I have the slightest sensation from my bladder. I have to sleep in cotton so I have the same tactile and temperature sensations everywhere. This is a brain malfunction, not a psychological anxiety.

<Some of my neurological symptoms include 24/7 localized pain on this one spot on the back of my head, balance issues (I can't stand still because I begin to stumble, so I have to fidget around), difficulty remembering words, typing the wrong word (in my school papers, I would mean to type "minute" and wind up typing "clinic." stuff like that), difficulty processing new information (it's hard for me to watch films or read books because I forget what happened earlier in the plot and which character is which, etc), very poor concentration, poor short-term memory, smelling burning smells that no one else can smell (haven't had this in a couple of years, though), biting my tongue and/or clenching my jaw when about to fall asleep, and tremors in my hands and tongue, and sensitivity to fluorescent and flashing lights.>

These can are be tied to an organic neurological problem. I have all of these problems except the balance issue. I only have balance issues when my eyes are closed. Again, this is evidence of an organic brain dysfunction.

The diagnostic test that would be useful is a full NeuroPsychological Assessment. These are to test and measure the cognitive, memory and processing speed functions of the brain. It usually includes some basic psychological tests to determine it there are conflicting psychological issues but they are not the main focus.

I bet you have a few dysfunctions such as:

A limited digit span. This relates to how many items or issues the brain can process at the same time. Most people have a digit span of about 8. Mine is 2 or 3 on bad days but can be as high as the high teens on my high functioning days. I bet yours is between 2 and 4 when you are struggling.

Poor visual memory. This makes it difficult to keep track of characters or plots in a story. I can't read fiction at all any more. I get lost trying to keep track of the characters. My visual short term and immediate memory is in the bottom 5 to 12% of the population.

I used to have the jaw clinching problem so bad that I was destroying my TMJoint. I now take gabapentin (Neurontin) to help my body release the muscle spasms that were happening when I start to fall asleep.

So, I do understand all of your symptoms. They are real and explainable. Hopefully, you can get improvement with some help and nutrition.

What is a normal day like for you? Are you still in school or starting your career? How busy is a normal day? What field of work are you involved in? Some work/study situations can be metabolically toxic to the brain.

mrsD mentioned nitrous. Have you had any general anesthesia for surgery in the recent few years?

Have you had any personality changes lately? Maybe less patient and easier to become irritated?

It would also be worthwhile to get a full hormone panel done. The complete panel is about $600 to $800 if done properly.There is a referral system to find a hormone specialist in your area at https://www.womensinternational.com/..._referral.html Most doctors use a shot gun approach to hormones. Many need a more targeted approach using bio-identical hormones. If you hormones are out of balance, this will be the best money you have ever spent.

We are here for you.

My best to you.