OP, I've never had a concussion and have NOT had a headaches in over 25 yrs, and I believe all due to taking Grape Seed Extract....now if this would/could help you, don't know until one tries..... You sure have taken a LOT of pharma drugs and still have issues....So why not think about this.

Here this D.C. Dr. Silverman talks about all the natural remedies and he does mention Resveratrol which is of the Grape family.

Manage a Concussion with Supplements & Vitamins | Fullscript