I have recently been diagnosed with primary Raynaud's by the GP, the same condition that runs on the female line of my family on my Mum's side. Primary Raynauds is a benign condition caused by an over active sympathetic nervous system that causes the arteries that feed the hands and feet to over contract, starving the extremities of blood. The fingers, in my case, first go white, then purple, then red as the blood returns. Cold temperatures and/or temperature fluctuations trigger Raynauds, and the extremities turn very cold. Thankfully mine is very mild - my Mum's is more severe-and I do not experience any pain. Does anyone else have this?
If I remember I'll come back here in a few months after my appointment and let you know.