Omg, everything you have described is exactly what I have suffered with for over a decade! I’m female, Started when I was 19 and now 33. Only happens on my hands or feet. The itching/burning comes out of nowhere, especially at night. It’s so severe I start to bite into my hand for relief. It can last up to an hour and then poof it disappears like nothing ever happened. I can’t seem to pinpoint in all these years what is triggering it. I’ve also noticed hot/sweat is one trigger. I’ve dropped a lot of weight and put on over the years but it doesn’t matter what my weight is, it still happens. In all these years, the only relief I’ve found is a Zyrtec which I’ve recently started taking frequently. I take one every few days. It definitely keeps the itch away but if I miss taking it then it almost always comes back. I also have psoriasis on my scalp, since I was young. I have no idea what it is or what causes it! If you find any other tips for relief please let me know