I'll share with you what I see... but this is not a diagnosis ...

Alot of caffeine

tyrosine-- can stimulate the nervous system..but it takes some time.

Macuna is an extract that contains dopamine--- our PD forum uses it for Parkinson's. Dopamine will stimulate the heart, and raise blood pressure.

Rauwolscine is controversial...and affects serotonin receptors among other things.
http://www.uk-muscle.co.uk/supplemen...ive-guide.html

So right there are some complex potential effects on your nervous system by upsetting neurotransmitters.

2) Arginine and citrulline dilate blood vessels. They increase NO in the vascular lining. Taking high dose arginine, will sometimes stimulate the herpes virus (both simplex and Zoster) to replicate.
But you only had this one once before... two consumptions may not be enough to be a viral stimulant. Arginine will dilate blood vessels, and contribute to low blood pressure in some people.

Betaine is acidic. It is typically used to increase stomach acid.

Creatine is dangerous if you are not hydrated enough. It can cause twitching or cramping of muscles.

Most of the bodybuilding powders have magnesium oxide in them, and that is a laxative. Some people get diarrhea an hour or more after taking magnesium oxide.

A cramp in the GI tract will set off a reflex in some people where the blood pressure suddenly falls, and they can feel frantic or even faint. This is called the vasovagal reflex.
http://en.wikipedia.org/wiki/Vasovagal_response
If you compress the nerves in the neck, strain or get a cramp in the GI tract...this can happen. It can be alarming to some people and be mistaken for a panic attack.

If you are still using a creatine product, I'd stop that now.
Secondly, for the twitching... take a quality magnesium supplement or soak in lukewarm epsom salts for a few days. SlowMag is a good affordable one at WalMart, take one of those twice a day.
Also you can eat some almonds... 3 oz have 270mg of mag in them. Twitching muscles can be from low magnesium intake. The magnesium in the powders is the wrong kind, usually, as oxide is not absorbed. Twitching can happen with low blood sugar also. If it happens more when you are really hungry that would be a sign.
Avoid sugar, and carbs and eat lean protein, fruits and veggies and low sugar should resolve.

The pains you are getting, may be paresthesias, and those can come when anxiety is high. People do not breathe normally and the acid/base quality of the blood changes, and that upsets sensory nerves. So panic and anxiety should be avoided...there are relaxation sites on Google all over, to help people learn to breathe better and avoid these symptoms. Try to relax, eat conservatively, with only moderate fat, low to moderate carbs low sugar. Try not to dwell on alarming things, and rest up.
Many of the bodybuilding products are very iffy IMO... and can really cause alot of grief in some people.