I tried to post on my thread twice....as I wanted to answer your post.....but I cannot get it to go through....so I am starting a new thread to reply to what you said.
Maybe the following will validate what you are saying about sweating. I once had a reaction to a shot and got hives at the spot....think it was the oil in the solution from what I read about the kind of shot I had. I did sweat from doing work outside- I really sweated (but not intentionally to get rid of the hives -it did not occur to me that sweating would be effective) but nonetheless the hives (after two weeks of having them) went away. I must have sweated out what was left in my muscle after the shot.
This time it is a different kind of itchy thing.
IN thinking about what I have done differently.....About one month ago I started taking probiotics and was taking more than was recommended. The research on side effects barely exists but I found one case where a child broke out in a rash. Just stopped taking that.
I never used caffeine but about a month ago began drink small-moderate amounts of caffinated iced tea. I stopped drinking that about a week ago as I did notice though that when I drank it- it heightened the itchiness. I think because caffeine is a stimulant. That is why I think the xanax helps a bit because that is a calming med.
I do think that the stomach plays a role in so much re: our bodies. That the stomach should be in good health. That is why I asked the question in my very first post - if anyone had stomach issues....who was itchy.
I have had stomach issues and that is why I took the probiotics. But in my case....I have over the years actually had better luck with antibiotics. I know some would disagree with that method as some people can get awful stomach problems from abx like someone told me that she got c-diff in my post. But I am the opposite at least so far.
Scabies was ruled out by my derm. But I am awaiting bloodwork results as liver or kidney issues.....or thyroid issues and other things can cause a rash.
I am glad your problem is alleviating. It sure is hard to NOT scratch but I do agree that it can make it worse.