I used to be on amitriptyline...it didn't help with the pain but did help me sleep. This was during a very rough patch when my RSD was getting worse and spreading a lot. I wasn't getting any sleep at night...seriously it was maybe an hour total made up of 10-15 minute blocks over an 8 hour period. It was awful. The amitriptyline let me sleep for 3 consecutive hours each night...still not a lot but I was able to handle everything so much better with that sleep and made much better progress in PT too. I stopped amitriptyline about 6 months after I started because I began tDCS treatments and those had me sleeping 6-8 hours a night without the use of meds...but the amitriptyline was a lifesaver before that. You simply cannot function o dr expect to get better when you're not sleeping.