Enlarged Heart Syptoms? Please read

Im 18 years old and lately I've been experience some unpleasant pain in my chest. about a year in a half ago I went to have a strees test at the hospitial. I went there because I was have adnormal heart beats (sometimes it will be at a normal pace then it will suddenly speed up for no reason) also went there for light chest pains.

 Then it was times I would fill dizzly or just tired. I had a stress test there and the hooked me up and I ran on the tredmill while I watched my heart rate. The doctor said I was in very good shape and that my heart rate was normal. But the syptoms still occur even today. Recently I've been filling pain in my chest and the rapid/adnormal heart rate is still there. Should I go back to the doctors and have them check it out again. Also should I ask for an X-ray?

Post Edited (brotharedz) : 1/15/2010 3:03:29 PM (GMT-7)

Okay I had visit the doctor the other day and told him about my symptoms. They told my blood pressure which they said was pretty good. Then I had an EKG and they said that my heartbeat/rate was normal and okay. The doctor told me what might have been causing the chest pain is a slighty torn muscule on the left side of my chest from not lifting weights properly. The gave me some medication for it. So everything sounds okay. Is there any need for an X-ray?