A few months ago I experienced what I thought was a heart attack after combining MDMA+Cannabis (Roughly 1.5g MDMA) An ambulance was called and my heart rate was measured to be 170bpm. They were very polite, took me to hospital and gave me some beta blockers to calm down and I slept it off. I believe it to have just been a severe panic attack however they were not very clear to me about what had happened and discharged me. If I had done any real damage would I have been informed? Before this experience I had a fair few trips under my belt and never even had a bad trip, even at high doses. Now however, whenever I trip I feel as though I have a pain in my chest and have constant thoughts about a heart attack and dying, all though both times it has not happened and I've slept it off and been fine. I have also since visited a walk in center, explained that I was concerned about my heart, and after checking I was informed my blood pressure, heart rate, and oxygen levels were all normal. After tripping again the same thing occurred and I tried to rationalize it in my head much to my dismay and this fear/pain went on until the trip ended. I am 18 years old, with no history of a heart disease or any physical problems. All signs point towards it being anxiety/panic as the more I try to feel my heart rate or think about it the scarier it gets. It often feels as if its rapidly speeding up and feeling like it will just stop. Is there anyway way to pin point the cause? I now have an obsession with my heart.