Hi Vee,
Thanks for your input and, I'm REALLY sorry to say, that sounds like what's wrong with me. BUMMER. Just another scary something to deal with. I cannot find much on-line information either, at least from one night's worrisome search.
I do think I'll find a new doctor as one that says "I don't know" and does nothing to find out is less than reassuring.
Hugs - Barbara