Hello, I am in my 50s, was in a car accident where I hit a deer, my neck whiplashed, had an mri, from c 2 to 7, diagnosed as severe arthritis. GP put me on nortriptyline for pain, I am only on 10mgs, I have cramping muscles, heart racing, and general fatigue all the time, should I stop taking the meds, I meet with my doc tomorrow!