I just read through this entire thread -and yes I aslo have Renaud's!
I was diagnosed 30 yrs ago, when i freaked out my gyn doc. I had an appt in February that year, of course it was cold, and of course i was running late, so I didn't wear gloves. I got there and she thought I was dying because my fingers were all white/even blueish, and ice cold.
LOL - I thought that was completely normal at the time!
It doesn't bother me too much sking - yes, my hands get cold, so I use down mittens and hand warmers, but it actually bothers me more with an abrupt change in temperature. I HATE the freezer section at the grocery store. I also have cold urticaria (basically I can get hives due to cold or change in temperatures) Gym class outside in high school was the worst. So I'd have to go outside in the cool or cold temps in my shorts/t-shirts and get hives and cold, white fingers!
I have learned to manage it for the most part. I know I need to have down mittens (not gloves!) for skiing, wear gloves for driving or running/walking/hiking always, even when it is 40 degrees or more, and goretex sneakers for running or walking on cool days!
Fast forward 30 years, I freaked out my general MD last year. I broke my hand skiing year (see my post about hand wrecker poles!) But I didn't go to the Dr until 2 days later when I got home. Again it was January, but this time I couldn't wear a glove because my hand was so swollen. So the Dr sees me, my hand is swollen, bruised, but freezing cold and my fingers as white as a ghost. He thought I had compartment syndrome (complications form the injury, possible fracture) I had to explain the cold, white fingers is perfectly normal for me :-)