Shingles is an aftereffect of the chickenpox, not stress.
You should look at the Wikipedia page for shingles; it does not sound one BIT like you have shingles. I'm no doctor, but from what I've heard abut shingles, it's not as crucial as what you're going through.
The Wikipedia page has a picture of a man with shingles on his chest ... do yours look anything like that?
Good luck with the next doctor. I hope s/he's very gentle and caring with you ... I know doctors like that are hard to come by.