I too have heart issues. I have Irrational Sinus Tachycardia. I can just be sitting here and my hr will go up in to the 140's-180's. But it's from the sinus node not ventricular tachy or fibrillation nor atrial tachy or fib, so it's not lifethreatening....except I get dizzy and lightheaded and have passed out before. No treatment for me because beta blockers drop my blood pressure to around 80/50 and surprisingly I can't function then! I wish you luck. Get a good cardiologist and ask questions. Always ask questions. I work for my cardiologist and he hates it because I know the questions to ask and I'm a pain in the neck patient.