Carole, I have something similiar that I've messed off and on with for 25 years, only it's mostly in my toes. The old-fashoned word for it is chillblains, and they are AWFUL - extremely painful. I am suffering incredibly right now because my feet got chilled a couple of weeks ago (in a matter of minutes they turned into blocks of ice while riding in a car) and once the tissue damage has happened it's Too Late.
We are also in a single digit freezing pattern here right now and expecting 14 inches of snow in the next 48 hours, so that will not help things.
Yesterday I could feel it going into my hands and started paying attention immediately. I think I thwarted it from the fingers for now. Wearing layers, keeping the extremities active and preventing it is the best thing according to the doctors. (I also am using a space heater - try combining that with "flashes" and you can just guess what kind of mood I'm in.
) There's quite a bit on the web but be warned the pictures can be HORRIFYING!