I have been hving muscle twitching in both of my arms in the upper arm. They are not painful but annoying. I' m talking about big twitches like the large muscle in the back of your arm. My doctor put me on potassium and 5 milligrams of cyclobenzaprine at night. But muscle twitching still occurring. Is my body trying to tell me something. I have had triple bypass surgery 20 years ago.