Hi... About 3 Years Ago The Itching Started When I

Hi... about 3 years ago the itching started when i was pregnant.... miscarried, then got pregnant with my daughter it worsen.. my dr did a few tests but couldn't find anything, prescribed me benadryl and steroids nothing helped... now I'm itchy but not pregnant...the itching usually starts from my vagina to my scalp. I've tried cooling lotion as well and nothing helps... I'm going crazy trying to figure what's wrong with me... I'm RHnegative