Raynaud's and SFN present very differently. Whereas you may have burning and such with your SFN all the time, the Raynauds is more specific to temperature changes. So the pain and color changes are during the time when your hands are exposed to the cold. Typically, they turn white when cold, then blue when oxygen is low, then red when the blood returns...in this cyclic pattern. Yours sounds more like typical SFN, not Raynaud's...which is a good thing (not to have SFN, but to NOT have the Raynaud's on top of your SFN).

I think your vascular changes may be a clue to your SFN...and the root cause. Has anyone explored this?