I feel really nervous for almos everything and my left arm feels weird with a little pain, also I feel in my back like heart palpitations. One day my left arm around my bicep and tricep start moving like palpitations. I know that every time I feel nervous or I feel exited I statart with all this sintoms. Other thing I notice is that my stomach if not relax, is like when you try to hide your belly but mine is all the time and I don't try to hide my belly. I hope some of this syntoms help you to answer my question.