Skin rash

Hi guys!! Looking desperately for help! I've had the most itchiet, painful rash all over for 5 months now. Stomach, back, arms, legs. Been to the dermatologist 3 times, no answers, just dermitis. Went to allergist Friday so excited that I'd finally get answers and get relief. No allergies!! I read an article about anxiety rash. When it started 5 months ago my anxiety was pretty high, I've since been working on it and have lowered it most days. The rash is still here and getting worse. No dr can seem to figure it out. Tomorrow im starting a leaky gut diet as I read it can cause a rash and yes ANXIETY! Hoping this helps!
So my question? Has anyone ever dealt with this for so long and what did you find out and what helped? I'm miserable and it keeps me up all night itching making my anxiety worse from lack of proper sleep.

Nothing has helped and the steroid creams caused me major anxiety. He's the top dermatologist around here. He did 3 difffernt biopsies all came back negative. It's causing unneeded anxiety not knowing what Is wrong and the 24/7 itch And pain of the rash.

Thank you I hope so. ❤️

Thank you!!