Have you ruled out laundry detergent? Those concentrated detergents that come in small jugs are, in my experience, both stronger and more allergenic than the regular kinds.
First try using the old-fashioned laundry detergent, the simplest, clearest kind you can get, the lowest in additives - Ivory Snow, Dreft, or any of the kinds that say "clear" on the package. Don't add fabric softener or bleach. Wash a set of sheets and nightclothes and underwear with it...half the usual amount. of soap..double rinse cycle. Then run this stuff through the washer again with no soap and ho****er. Then have a long shower with the least soap possible, rinse really well, and let the water run a bit cold at the end. Don't put any lotion, astringent, or other product on your skin. Remake the bed and sleep in the double-washed nightclothes and see if you itch less. If you get relief, I think that's a fair indication that your usual laundry detergent doesn't agree with your skin.
if not, a product called Caladryl Clear will provide temporary relief. Also cold packs on the itchiest places. I have used this with good results lately on my aged mother, who had an itchy spell after a course of antibiotic treatment.
If you establish that it's not your detergent or any residual soap on your skin, see a doctor. Tell him or her how you've tried to rule out detergent. This doesn't have to be your primary care doctor. An urgent care or ER physician is just as good in an acute situation like this.
(If you're not used to oak pollen, say if you've just moved East from a desert area or from a very urban area where there are few oaks...oak pollen has caused some serious skin problems in people who weren't used to it. A friend of mine and his toddler had this experience after relocating from urban NJ to NC, with its many oaks. But this kind of allergic trouble usually happens in the late spring and early summer rather than now.)
I've been fat, and I've been thin - and thin is better.
There is a better way. --Alaine of Lyndar
HW: 234. SW: 228 (18 June 2015). GW: 137. Specs: 50ish, 5'4"