what are the odds of me having a heart attack? PLEASE HELP...?

im 17, 6'1, 170 pounds give or take... im not in horrible shape but not in the best... i have been to the hospital and my doctor they did blood work and stuff and said i was just having panic attacks... and i have svt (supraventricular tachycardia) but thats it... they said my heart is fine... but a a week ago my mom had a heart attack at 39... shes not that healthy.. shes about 5'9 and 260 pounds... but i went like a few months ago and they told me i was fine... but the "panic attacks" havent completely stopped but they have stopped happening every second of every day... but i still get these pains in my left are, chest, and jaw... and i throw up.. and my left arm goes all weak and stuff.. i just dont know what to do anymore...