Hi swc welcome to the forum, I have had 4 of them in the past three years and yes what your describing could be your heart, remember Diabetics symptoms are totally different than your regular Josephine's
it is a easy procedure to go through, remember it would take more than a couple of years of poor control to do severe damage to your heart (it doesn't help)but it probably has lot more to do with family history, as I said it is easy procedure to go threw and you should b up and running in know time