For crawling and electric feeling: B12 injections seem to help for me.
Be sure you take the right kind of B12, there are 4 types. Methylcobalamine and Hydroxocobalamine are the good ones. I think that in the US you can only get the Methylcobalamine, where I live, I can only get the Hydroxocobalamine. You can give the injections yourself, subcutaneous.
If you have never done injections, you can ask a friend nurse, or a friend with diabetes how to do it, it's very easy.
I don't have rashes, only eczema, so I can't help you with that.