Probably due to deconditioning, doubt if you have any heart issues at 21, it's possible but it would be very, very rare.
Jon
thanks jon, i also like to add i am currently taking zyprexia 5mg once at night.and take cipralex 10 mg and lorazepam 1mg twice daily.
I would c a cardiologist and have a stress test, ecg and echo to c d status of my heart, how is ur bp