At 11 days sober it doesn't sound like alcohol withdrawal symptoms. It actually sounds like it could be cold induced hives or some other sort of allergic reaction. I would get to an online appointment with an ER doc if that is an option or call an urgent care clinic and ask about getting treated. I don't think they'll want you to come to a health care facility but who knows except for a health care professional? Call in anxiousrock. Now. I'm betting not hives as that doesn't come on super-fast like that, but again clear that theory with a doc, and NOT Dr. Google. Or Dr. SR.