Financial talk

I am in my late 20's and got a weird rash on my foot. I went to the doc who said he didn't know what it is, that I need to see a specialist. The rash is now on my leg and on my stomach, and my arm and hand get tingly and numb ( my left two fingers are numb 24/7) my back is now hurting to the point where I can barely stand for just a few minutes without pain. It runs from lower back all the way to my neck. I know this isn't really a place for medical help but I don't have insurance and going to the doctor right now would be a big financial strain. I mean if it gets much worse I'll borrow money from my parents, but if anyone has any clue how all these symptoms tie in together I would be sooooo appreciative. Thanks The rash is oval, about an inch long. I thought it was ring worm at first...no itch or anything. The rash came first, then the numbness, then back pain