Welcome to NeuroTalk. Sounds like you have been through the wringer.

If sounds a lot like PCS but could also me a combo of the impact and drinking/drug toxicity. The injured brain is far more intolerant of chemical toxins, alcohol drugs etc. You need to do everything you can to detoxify your brain.

This would include, no caffeine or alcohol or other stuff. Get started on a daily vitiamin regimen of a B-100 complex, 200 mgs of B-6, 500 to 100 mcgs of B-12, Vit C, Vit D, Vit E, Omega 3's, magnesium, calcium, plenty of meat protein (pork is best), all of the anti-oxidants. Do not take Vitamin C on an empty stomach.

This regimen will take a while to start to show a difference ( few weeks) but the detoxified brain will feel much better.

You also need to rest in quiet and low visual stimulation.

My best to you.