hello, im not trying to freak you out, but u really need to see a cardiologist, and more specifically, i would recommend for an echocardiogram, that might rule out the heart problems IF its not.
take care..
I would ask to see a carioligist and have some test done just to make sure. I had several test done and was told nothing was wrong for years until they finally found a tumor inside my heart. I would go as far as I had to to rule out my heart even a cath and/or a TEE