Dont know if these r panic attacks or heart attack?

Please someone be willing to read and give some advice. I was d by a man when i was 17 i am 26 now at knifepoint and he is now serving a life sentence. after the i started heavily on drugs, ectasy, crack, alcohal, anything i could get my hands on. when i was 23 i met my now husband and just recently stopped doing drugs for good. i just gave birth to my first daughter in september she is 3 months now and the last drug i used was roxy's for almost a year and then it happened. on the way home from orlando a 2 hour drive for me i went into what i THOUGHT was an overdose. i thought i was dying from the roxy's. i called my husband made him stay on the phone with me and actually KIND OF controlled it the next to hours. i was SO SCARED of that happening again i quit cold turkey! i went through the withdrawls (horrible) but not scarier than a heartattack.....i have even quit smoking cigaretes because I find they make my heart start to race also. well being drug free with nothing in my system helped for a week or two then went out of town with my husband to his fathers house to lookk for a house to buy and i had another really bad one making it like my 4th or 5th one WITHOUT drugs in my system. that was scary cause i thought it was an overdose. well i went to the hospital told them i felt this warm sensation radiate throughout my whole body than my heart starts racing i cant sit down my face gets hot sometimes my muscles will hurt afterwards and the sense of impending DOOM like my DEATH is staring me in the face. they did an EKG and all kinds of tests and said they saw nothing wrong with my heart and it had to be panick attacks. but y after all i have been through NOW? in a way i am grateful because it made me stop doing drugs BUT i want my life back, i HATE constantly worrying when and where the next will happen what if i am home alone with the baby? this is the SCARIEST thing i HAVE EVER BEEN THROUGH in my whole life. i feel alone and defeated. I just need to know what anyone thinks i should do. i dont know about anxiety meds never liked zanex and they make you SO sleepy.........what if its NOT anxiety? please someone respond?