My husband has been having this issue for several months. He gets attacks where his Heart is racing and he can feel it pounding in his upper body, head and ears. Occasionally, this is accompanied by sweating, dizziness, burbing, gas and diarrhea. there seems to be no rhymn or reason when it happens. He could be eating, resting, working in the yard, watching TV. He has seen a cardiologist, ENT, gastroenterologist and primary care. No one finds anything. Help!!