You might have a partially ruptured esophogus or scratches from your nails in the back of your throat. There is also the possibility of elecrolyte imbalance, making your heart feel "weird," or you might've acquired a moderate ulcer because you have so little stomach acid.

I am NOT in any way a doctor, but those are some symptoms that can come around because of bulimia. Look it up on health websites! Bulimia can have fatal consequences and I would strongly encourage you to talk to a trusted counselor or authority figure to get help