six,

You need to try to separate your symptoms. Pain, especially head and neck pain are difficult symptoms. Pain meds are not reliable. It just depends on the individual. Sensitivity to touch is more a physical/structural pain.

The concussion symptoms would be the internal head aches, dizziness, confusion, sensitivity to light and sound, insomnia, memory problems, anxiety attacks, problems focusing, etc.

Eowyn has some great advice. I believe you need far more than a vegan diet can provide. The brain needs meat protein based amino acids. It is very difficult to get equivalents in a vegan diet. If I can find the research that supports this again, I will post it.

It sounds like you have a neck injury that would benefit from treatment and frequent icing. As Eowyn said, a physiatrist may help or a Physical Therapist or chiropractor. The treatment should be gentle. No twist and pop. Ice after each treatment. It can take 6 weeks or longer for the neck to START to strengthen.

Read the thread about vitamins and supplements. It has some more information.

My best to you.