tightening in left breast

Hello, Im turning 17. I weight about 175 and 6'1. I used to be super active, wrestling/football. but have been lazy lately. About a year ago i smoked marijuana and had an extreme panic attack. I had a strange tighening feeling in my LEFT breast only but it almost felt internaly. After the tighntess it would realease and then i would have a heat flash, then it would happen again. Without smoking marijuana in about a year it just happened the other day. By the way i do have anxiety and suffer a little derealization. I felt the same feeling, tighening in my left breast and heat flashes. Can you please explain if im having heart problems or just anxiety. I had a ekg/cardiogram last year and everything came back fine.