I have this SAME problem! :O
I never had any body problems until I started to smoke weed. I could run a fuckin mile in like less than 7 minutes with minimal breathing. Now, I can't even run across the street and down it kinda without dying from overbreathing! Godamn, and I have that heart problem too. I'll lay down and it'll be throbbing throughout my body and I can hear it really easily even if I HAVEN'T smoked that day. I also have respitory problems too...geez, we're all fucked up aren't we?