Hi,
Everyone's anxiety is different-but the symptoms are pretty basic but can vary in every person-rapid heart beat,sweating,nausea,choking sensation,dizziness,rapid breathing,etc. I suffer from a severe panic disorder and I defintely believe you do have a panic disorder it defintely sounds like you do. You are way too young to have a heart attack-so don't even worry-if you are healthy and take care of your self you will be fine. If I were you I'd see your MD right away-and he/she can refer you to psychologist-sometimes meds are the only thing that calms the panic down-because it can sometimes be so debilitating that you are unable to work/see friends/sleep...etc...defintely have it checked out....good luck-hope this helps...
Ashley