I think you can easily get into a situation where you're constantly assessing how you're feeling and comparing it to what you remember as how you were before. I read that after about 3 months the physical damage of PCS has healed and what you are left with is psychological scars, I don't hold with that myself, I think you can double that to 6 months or even a year for hormones to rebalance etc. I do think the mind controls the body and simple things like exercise, laughing, positive outlook and good company can work wonders. I wish more research was done into mtbi it's such a common injury but until drugs companies see a buck in it then there won't be the funding!