hi...im 24 yr old female...normal weight...not pregnant...don't smoke or do drugs...currently on beta blocker for svt...had an echo 1 1/2 week ago with holter monitor...everything was normal expect for some svt's...only possible condition is fibro...but now im having chest discomfort...its worse when im inactive...feels like pressure on my upper sternum...but not behind it...don't feel short of breath...heart rate seems normal...around 70's. This discomfort seems to be there constantly...at times more than others...i'm trying not to get scared...should i be? I see my doctor tomorrow...but i'd like some peace of mind so that i can sleep tonight...let me know if you've experienced something like this...