I found the post about vitamin D to be very interesting. I, too, was very bothered by all-over itching, especially at night. It's not meds, since I haven't seen the rheumy yet, and I'm on no meds at all. My hubby and I both take vitamin supplements, though. He read about vitamin D being helpful for something else and added it in for both of us. Now that I think about it, I haven't been bothered with the "nightime itchies" since I've been on the vitamin D. I think we're onto something here!
Found some information, which might be useful:
I hope that it helps!