Heart attack at 20! HELP?

Plaque in the arteries happens over time. I think you are obsessing over this 2 year binge you had and now you are having anxiety over it. I think your having panic attacks and it is causing the symptoms you are experiencing. Unless you have a heart malformation or defect, it is highly, highly rare for you to be having an heart attack. If your worried go to the doctor and have an EKG test, it is painless and it will be able to tell if you've had previous heart attacks. If you are clean, I would highly recommend you get therapy for anxiety and maybe go on medication. Good luck!