My SIL had an irregular heart beat and palpatations. She had excess heart tissue that they burnt away with an angiogram. Was over with quickly and given her no trouble since. They even gave her the all clear for another baby without a high risk label so she is happy about that.

Not saying that that is what it is, but if it is, they can fix it nice and quick and have you fighting fit in no time. Hope it is something a little simpler though!