What causes 10 second feeling of fullness like a ballon inflating in left breast and chest? no pain.pcp says heart ok.gas?seek cardiologist?

Rising sensation: A rising sensation that last 10 seconds in the stomach is either gas or abdominal epilepsy. With the latter one experiences a flip flopping or rising sensation in the upper abdomen and sometimes feelings of anxiety. Autonomic epilepsy may also cause pilo-erection (hair standing on end) change in heart rate and altered mental status. Its often overlooked or misdiagnosed.