Hi sbosco, I am so sorry that your son has to go through this. I was in an accident last May and have been dealing with PCS since. I wanted to respond to your question about amitriptyline. I started taking it in early Dec. and it has helped my headaches a lot. I started on 10 mg. and went up to 20 mg. after Christmas and the main side effect was drowsiness, but it went away after about three week. Dry mouth is also a side effect - but not as bad as all the headaches. I am 51 years old and it probably takes longer to heal when you are older. Hope this helps and best wishes for your son.

PS. It took about 2 1/2 weeks before I noticed any improvement.