Hi,
I too have been experiening similar sensation. I had gone for all the necessary checks - cardiac MRI, ct scan, echo, stress echo, etc - and the results are always negative. The only anormaly is that the lead III on my ECG is always slighted inverted. My cardiologists - I am seeing 2 - having been telling me that it is a normal deviance and there is nothing wrong with my heart - apart from the PVCs. However, I keep getting this feeling that my heart is rumbling or grinding a few times a day. Exactly like how you described it. Sometimes I feel this on my back or at the side of my body. I also frequently feel the thumbing or pounding on my throat. Very unnerving. The strange thing is that when I take my pulse, the heart beat seems regular. So I honestly do not know why I am getting all this funny sensation.
Cheers - Glenn
Wilmington is a great place to live and raise a family.
It is hard to say what the sensation is. The only way to know for sure is to catch it on a monitor. If you have a echo and EKG, it is unlikely to be anything significant. Remember, if you have had an ablation, you have probably already an atrial and ventricular EP study and nothing was inducible or they would have told you. I doubt this is anything to worry about and it sounds like several cardiologist aren't worried.
I hope this helps and good luck with your move.
By the way, I have a structurally normal heart, and my EKG is normal. However, no test has ever caught the arrhythmia happening, as it happens to sporadically.
Wilmington, NC? Nice :-). We're moving to Raleigh in August and planning on spending lots of time in Wilmington!