Hello. I'm 21 and I suffer from anxiety. I have no heart problems that I know of. But lately I've been having chest discomfort(tightness) for 1 week and a half now. The first night I felt it I went to the ER and they did an ekg & blood work but everything came out normal. They said it could of been costochonditritis. (Yet I'm not tender at the touch) Today is about my 3rd time feeling that way, I kind of feel it on the upper left side of my chest. Anyone else feel this? What can it be? Any idea what I can take?