I've never been diagnosed by a doctor, but I wouldn't be surprised if I had it. My fingers frequently go white when it gets cold - like in that picture on the NIH site. Grocery stores are killer for me. I hate getting frozen foods - even in the summer!
If I have to wait for my DH to pick me up at the metro station in cool weather (not even cold), I end up cranking the heat and/or sitting on my hands for the ride home. If I wait for a bus in the cold weather, my hands are useless lumps of ice - even with ski gloves on. Sticking my hands in warm water is torture (throbbing, tingling, pain), but at least it gets the blood back to 'em.
When riding in cold weather....my hands turn to ice blocks, are incredibly painful, and then - poof! - I hit this threshold where they are fine.