Ok, I do not know where to start really... other than it started when I smoked weed, I used to be a stoner, so I smoked an 8th in 2 days and this was for 4 months... One night I was dancing while stoned to some music and all of a sudden my heart when really fast and I could feel it rushing all over me, i ran upstairs and had to get my friend to call an ambulance, It kept rushing to 190 then dropping so I had to go in... this continued to happen. I smoked a few times after that and same thing happened so I cut it out my life completely. This was 4 months ago. I have now noticed I am unable to do any acitivity without my heart racing... running up and down my stairs results in it being at a good resting heart rate of 70bpm to 170bpm.. If I do any street dancing even jumping up and down to bassy songs in 30 seconds it goes between 150-204bpm. Then moment i stop it will quickly return to normal. I did a mini sprint in a&e and it went from 90bpm to 204 and they caught it on the monitor... and then it returned back to normal in 1 minute. I literally spinted about 50 meters and it resulted in this. I am not sure why. I used to do kickboxing and dancing and 3 hours a day on trampoline when I used to smoke weed and all of a sudden I cannot do any exercise. If i do too much I will fall to the floor and my body would jerk until my heart would calm down again then I would be up again as if nothing happened within minutes... Has anyone else experienced this. My ECG came back normal my doctors noticed it said a "slight atrial enlagrment but she didnt think much of it and ignored it" I am 21 years old and this is ruining my life I want to be active again, I can't even dance and party with my friends it is a joke