Gjensen-my chest pain sounds similar to yours. I have it first thing in the morning, with exercise, and stress and sometimes random. Its clearly what i refer to as "heart pain" because i know its not a sore muscle, rib, or nerve pain and its specifically on the left side often migrating up my neck to my jaw or down my left arm. Ive had many workups and only the usual POTS type evidence has resulted (sinus tachy, minor PVC's, minor regurgitation). Im really starting to think i may also have the vasospasms. Do you have Raynauds by chance? Wondering if its like raynauds in the heart???