Any chance the "skin crawling" is kin to Restless Legs Syndrome (RLS). A long shot, but I have a long term lower back injury which may be responsible for a lot of my problems.

Again, just a thought. MY RLS is miserable to live with, luckily I have a good Neurologist who figured it out, got my dosage right and I am doing much better with that one problem.

Good luck with it.