I have the hands and face flushing. I've figured out that the face flushing is related to food or drink trigger for me. Caffeine does it, wine or alcohol does it, sometime sugar as well. The hands swelling and burning for me irelates to osteoarthritis, but there are a lot of other things that fibro suffers experience that it could be (raynauds syndrome, etc.). I've asked several doctors and none were really responsive. Add it to the list of unexplained fibro phenomena.
If you are having pain triggers on both sides of your body both above and below the waist it sounds like you too could be entering into the fabulous fibro world. Seriously, I have heard that symptom before and many others. Everyone's fibro seems just different enough to confuse those of us with it and our docs.