I have fibromyalgia among a list of other problems. High blood pressure, two artificial knees, back fusion. My doctor has me a morphine (for pain) gabapentin (nerve pain) and amitriptyline (for fibromyalgia) and I have finally been able to get back to exercising. Just hope I don't over do it, but I have lost 6 pounds in 5 weeks, and I am happy with that result.