Honestly, who knows. All my blood tests and exams come back perfect. I am statistically in great health, but I certainly do not feel it. I fear there may be some other problem, hopefully nothing like cancer, but it wouldn't even surprise me at this point. I've gone to a heart specialist, kidney doctor and had a few extra doctor visits and yet the only thing I know is that I have(or had) high blood pressure, which probably caused my few heart palpitation episodes. This could be because of many things, like hereditary, or because my diet was terrible. Since I've been watching what I eat, I feel better, but now feel bad again, maybe because the meds were offsetting my diet. Also, there are my kidneys, which despite being a bit abnormal, all tests I've had came back as no real issue.
So, if you don't want to read all that, all you need to know is that I don't feel right still, despite being in apparent good health.