Amitriptyline
"Was diagnosed with plasmacytoma in the left mandible and went through radiation therapy 5 days a week for 5 weeks.  The radiation did a lot of damage to the inside of my mouth and tongue. I now have an exposed bone in my gum by the molars. I was healing nicely then out of the blue I started having severe pain in my jaw.  It only lasted less than 10 minutes x 10 per day, but it would come on suddenly and was severe. My oncologist said it was probably nerve regeneration causing the nerves to spasm. He prescribed amitriptyline 10mg and said to increase every 3-4 days until I start feeling relief. I am on 30 mg now and no pain at all and yes I have been sleeping great. My mouth was already dry from the radiation so no problem."