Thanks for your response to my question on 10/4. I am writing again to ask if a strange episode is neurological in origin.
I was sitting down about 30 min after dinner (no unusual food) and suddenly my heart started pounding and I felt lightheaded (not room-spinning, just dizzy/faint). I had to lie down. My heart was going fast, but the more noticeable symptom was that it was beating HARD, much harder than I had ever felt before. Although I was dizzy, I could see and hear and was conscious enough to time my heart (110 bpm, totally regular). Mentally, I was almost euphorically calm (in retrospect, it seems unnaturally calm). No pain or shortness of breath.
The bounding heart/dizziness persisted for about 90 min; I was conscious the whole time. Then it faded over 5-10 min, leaving me with all-over body weakness and nausea (I did not vomit). Although the unpleasant nausea faded after 12 hrs, my stomach felt unsettled and I was not very hungry for about 5 days.
I feel better now, but I do notice that my heart will sometimes pound for no apparent reason, usually for 30 min-2 hrs at a time. (And it's nothing like that one time in intensity).
I saw my PCP, who ordered blood tests for thyroid function-- all normal. (About 7 months ago, I also had CBC, Chem-12, ESR, ANA, RF blood tests-- all normal).
Do you think this was a neurological event? I've never had anything like it.