The two common causes of heart palpitations are nutritional deficiency (magnesium, B12, Coq10, phosphorus, calcium) and lack of proper rest. Do you also have crazy insomnia? The two usually go hand in hand. In more rare cases it would be a mitral valve problem but you would've had these since you were a kid if that were the case.
If the reason is rooted in nutrition, then a high powered psychedelic will just deplete you further. You don't want to be having heart palps while tripping because it will make you paranoid, and with something like DMT you might even start to believe you are dying. When was the last time you had a green salad, or any kind of greens in your diet?
Consulting an MD would make more sense than coming here, but in my experience MDs won't do much about heart palps, especially if your blood work appears normal to them. They might order an ECG but you would have to be having the heart palps during the test otherwise you will be declared normal.
If it's really bothering you, I'd start with nutrition. Don't do drugs in the mean time.