Hi Shutterbug.
Welcome to the forum. You will find lots of support here.
I used to get tachycardia when I smoked. But it has completely disappeared since I quit.
I would say give yourself some time to detox, but if you feel awful, go see a doctor. There may be more going on than a bad reaction to pot.
Good luck and keep us informed.
This is a great place for getting help and understanding.