I have a compulsion for checking that I have a heartbeat and

Very interesting. I'd say general anxiety coupled with a bit of hypochondria. Try increasing exercise as much as you can and recognizing that if you're conscious, you have a heartbeat.

>>8583264
https://en.m.wikipedia.org/wiki/Cotard_delusion

>>8583304
Entered my mind, not OPs diagnosis. Cotards is severe

you are just neurotic

>>8583264
Why? Suppose you go to check and it turns out your heart isn't beating. Then what do you do?

>>8583353
Freak the fuck out

>>8583312
It's hard to tell how progressed it is. He could still be in the first stage of it.
I'd recommend talking to a doctor about it.