Have you been to a dermatologist? Cryotherapy is sometimes an option to “calm things down”, administered at a lower intensity than when used to remove moles, etc. And, of course, hydrocortisone in the meantime. And select a hydrocortisone lotion that includes various “natural” anti-pruritic ingredients. And for really acute itching you can try to numb it with pramoxine. dibucaine, or lidocaine. But don’t overdue the “caines” — you can end up with “reverse-numbing” or hypersensitization.
Overdo
I will add that dibucaine 1% ointment, usually marketed for hemorrhoids, is really good for general anti-itch and doesn’t normally irritate or cause any sort of side effect. Search on Amazon.
btt!