How frustrating!!! I hope you are starting to feel better, and don't give up hope!!
Definitely don't go back to the dr who acted all superior... not worth your time. Good catch by the urgent care doctor... maybe he could refer you to a good rheumy?
I don't have any spots that sound like that, though I do have tons of skin issues... Let us know how things are going, and if you get further answers.
"You do not have a soul. You are a soul. You have a body." C.S. Lewis