Could be Raynaud's disease - I have it. My rheumatologist did some blood work to confirm the diagnosis.
Not much you can do about it - the doc says the drugs used to treat it aren't worth the side effects.
I was originally treated for a neuropathy of unknown origin, since only my feet were affected. My fingers just recently started giving me problems.
Meds I've tried -
Neurontin(Gabapentin) worked really well, but I couldn't handle the side effects. I tried Lyrica, but that didn't do much for me. Norpramin (Desipramine) has worked the best for my symptoms. If you search on these drugs you'll see that most are used primarily for treating other problems than nerve pain like seizures or depression. Not sure why they work, they just do.