First, Welcome to our neck of the woods.

You posted nicely, short paragraphs, informative helps us read information better.

Some links might help you:

Brainline - useful concussion / pcs information.

The forums Brain Supplement list.... Thanks to Mark of Idaho.

Being your 4th concussion, you may already know that their effects are accumulative on the brain; the injuries have some reparation possibilities but not all things have recovery, due to rerouting from the injury sites, etc.

You mentioned you had a bruised chin? - did you have your neck evaluated in the ER - some upper neck or Neck injuries account into concussive injuries, leaving quite a few of the symptoms you are complaining about also; so lots of ice therapy to the upper neck would be useful, daily.

Post-traumatic headaches, post-concussive headaches, post-traumatic migraines, which ever title the physicians want to put to them are real, and are devastating to many. Can be short-lived or long term, its hard to predict; although we all pray for the short-lived.

What you are / have experienced is not unexpected, sadly. Hang in there.

Find a good Neurologist, or Physiatrist (Physical Medicine specialist) - get all your symptoms addressed, keep records of the 'little things', ask about your neck if it wasn't checked in the ER... Do Not just accept meds without asking all about them, and expected possible side effects or withdrawal syndromes when stopping them (many new ones being used cannot just be suddenly stopped).

Right now - REST. That cannot be expressed enough: turn off computers, tv, cell phones, and rest. Minimize reading, increase resting. Minimize even socializing except at home and with family. Avoid Alcohol. Drink lots of water You are very early into this process, more rest (REAL REST) now, hopeful better progress later. Some even avoid bright lights (me), loud places(me), large groups (I can't stand 4 people talking around me).

I don't know your work environment, but if you have to , begin the process for FMLA if needed to get the protection for time off - if you qualify at work for it. Or Short term disability at work coverage protection or whatever, check with your company's HR department if unable to work short days. Or, the car pulled out in front of you ? who was at fault? does that figure in here? does their PIP fit in here? - sadly just more questions for your injured brain, sorry.

But you need to obtain as much rest as possible.

I'm sure others will be on and contribute,

Best Wishes..........