Hi jewel,
this drug is usually called elavil here. I have heard of it being used for tmj and most of the comments were positive I believe. I myself take prozac and am glad that I do.
I'm so sorry to hear that you are having problems with a root canal. I just had one about two months ago and it went well, thank god. I was on a muscle relaxant and nitrous gas while they worked on me as it was a molar and my mouth had to open up. It was the most relaxed appointment i've ever had. When they do any work on you, don't let them force your mouth open too far and give you lots of breaks. If you end up having to remove the tooth, are they going to put some sort of spacer or something there to keep the other teeth from shifting?
I hope everything works out well for you. Gotta go.
God bless...
Carol