raynaud's syndrome
"After years of agonising pain in my fingers and toes exacerbated by army mountain exposure and "halo" training, along with cold water deep scuba work, I was finally diagnosed at 52 and at first put on beta blockers which made things much worse with multiple crippling attacks daily.  A secind dictir put me in Adefin (nifidipine) and within 48 hours the pain, the numbness and the symptoms were gone. Now we are experiencing an early severe winter some symptoms have returned, but are still managable on my standard dosage."