I am 23 years old and a bit concerned. On Wednesday night I experienced 2 hours of irregular (fast, skippy) heartbeat. It has continued occassionaly but not for any significant amount of time. I then noticed on Friday that my right breast, along the right side, was sore. Upon self- examination I noticed a sore lump. It is now Monday and it continues to be sore and now can easily be felt through clothes. It feels like a gumdrop, doesn't move, is slightly smaller than a golf ball and shaped like a figure eight or a circus peanut. I normally have tenderness in both breast before my period but never anything like this. On the off chance it was injured from a bra (no new bras and no bruising) I stopped wearing them. Its bigger and more tender. All else seems normal. I have no health insurance. Apparently pain is not usually associated with cancerous growth but I would feel ignorant to leave it unchecked (but until its free my hands are tied). Whats my next step? Anyone with similar experience?