I was diagnosed with silent reflux & gastroparesis. I was prescribed Reglan (metoclopramide). Having heart palps and stopped reglan (metoclopramide). Can 500 mg cause this too?

Check dosage. Side effects of reglan (metoclopramide) can be quite serious, but heart palpitations is not one of them. However, I am concerned about the dosage you are saying. Is that over 24 hr? 10mg every four hours is the higher end of normal, and Reglan (metoclopramide) is not a medicine you want to take for long periods of time. Please see the Rx'ing MD regarding this, and to go over your other medications and symptoms.