I have this every now and again (two or three times a week) but only in my left hand. The finger tips get noticeably more wrinkly and I lose sensation in my finger tips and/or get a burning sensation in my finger tips which makes it difficult to do fine motor tasks. I just have to wait for it to go away in a couple of hours. Any ideas on what it is or what I could do to get rid of it? I have mentioned it to the doctor but, annoyingly, it never happens when I am at the doctors!