You can Google the term Raynauds Disease and get the details, however i would just like to make a few personal comments and comments specifically about your situation.
I don't like the term Raynauds's Disease, I like to call it Raynauds' Phenomenon which indicates to me that that there may be multiple causes, of which Raynaud's Disease is just one.
Is that clear or am i confusing you?
You have an auto immune disorder and have been investigated for other autoimmune diseases of which Raynaud's Phenomenon is associated and you seem to be exhibiting this association.
I am not sure how far this has got us ;-)