Very, very agitated.

Hi, I was punched repeatedly in the head by a student with autism that I was teaching June 2011.  Had a terrible year of many doctors saying that I needed to see a psychiatrist and that my pain wasn't real.  Finally had an operation for torn rotator cuff in January and shoulder impingement.  Sadly looks like the severe neck pain that I have had since the event hasn't been cured by the operation.  ...However can move my arm better.  Diagnosed last Thursday with frontal lobe damage by a neuropsychologist.   This at first seem to help me as I felt that the consultant could really explain what I'd been going through. Since then have behaved very oddly and wonder if anyone can give me a reason why.  Can't seem to settle, very agitated, furiously angry all the time - not just when I lose concentration or get tired (usual stuff).  All made so much worse when my best friend suggested that it was all psychological.  Now I think of it, something like this happened last year when I didn't feel believed by a neurologist.  Is it a grief thing?  I was told that the problems I have are unlikely to improve. Have gone a bit bonkers and applied for two jobs in one day that I don't really think I can do. Haven't worked since the incident.  Puzzling - can anyone throw some light on this.