I was reading your post, and although I don't have any idea what it could be, I think you should see a doctor. Have someone drive you, since you are not safe to drive while dizzy. Since you don't have insurance, what I would do is go to your last doctor (rather than the E.R., because I'm assuming the E.R. would be more expensive), and ask to be seen. Let them know you don't have the insurance anymore but would work out a payment plan. Then let the doctor know you don't have insurance and don't want unnecessary tests, only the ones they really think will be helpful. Then when you get the bills, call the billing department and try to negotiate the price down or work out a payment-plan. Better safe than sorry and get this checked out, have a doctor examine you and look at the rash. Worry about the bill later.
All the best,