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OK, enough of fooling around on message boards like this. I think it's time to get terrified and start camping out in your doctor's waiting room. The pins and needles thing is what got to me. Also the hot bath story. Your diet looks great, especially for living in the UK! Everything you're doing is great. The results you are getting from even the slightest attempts at self-help are scary. None of this should be happening. You are not nor have you been doing anything wrong. The fact that it's getting worse the more you rest and attempt to intermittently exercise is not good, not good. Take a look at this:
Get thee to a physician! I'd start with an emergency walk-in clinic if necessary. Get yourself into the system as someone who has a serious problem that needs diagnosis. And let your friends here know how it goes.