For me, it is mostly internal factors. My obsessive worrying about how I feel and constant self-analysis is driving me crazy. I find it difficult to describe. I am starting to think that what I have isn't really PCS. Most of the problems I am having seem to stem from emotional stress. Worrying is very taxing on the mind but I find it so difficult to control. On top of health anxiety, I have the stress of living on my own for the first time and attending a new college. I have been seeing a psychiatrist who specializes in EMDR and I think I will try it. I am also getting a physical next week, hopefully with blood test. I'm also going to ask about referral to an endocrinologist to check for hormonal issues.