Hello all. I was diagnosed with ME/CFS in 2000, after 20 years of being sick (in a peculiar way --inflammation, numbness and migraine pain down my entire left side, head to toe, every day. I lived on Fiorinal). By about 1999 I had also developed about half the symptoms of the Canadian criteria. These included what seemed to be POTS. Specifically, I feel lightheaded and dizzy after walking for three to fifteen minutes, depending on the day. I also feel like all the blood had drained to my hands and feet, which feel bloated and almost too heavy to lift. I would sometimes fall simply because I mistakenly hadn't lifted my feet enough. (I have never fainted, because I sit or lie down first--e.g. I will sit down on a city sidewalk, in front of strangers--if I think I am going to black out.) Finally, two weeks ago, I was given an hour-long tilt table test. And I checked out just fine. The neurologist was very kind, and said he had seen several ME/CFSers who didn't check out any better than I did. Now, I realize that I consider a finding of POTS to be a "positive" thing, and that that is ironic... but like a lot of people., I get desperate for an answer, or at least to be able to check a single box on someone's list. Has anyone else had all the symptoms of POTS but "failed" the tilt table test? Is this common or uncommon?