Soap gives me hives, please help

So this has been going on for months now. Basically anytime I shower, everything from my body wash to my shampoo to my face wash makes me break out in hives all over my face, scalp, and neck, and itch. I didn't change any soaps, except for recently trying to find one that doesn't do this to me. They're usually gone within the hour but it's a REALLY uncomfortable hour. Tonight I tried anti-dandruff shampoo, thinking it may be better for sensitive skin. Nope, my scalp itches even worse than it has before. My face and neck are still red.

I try to take an antihistamine beforehand--today I didn't give it as much time to work as I probably should've, but it seems like some days the difference it makes is minimal. I'm going to try and bring it up at my next Dr.'s appointment in a few months, but until then do yall have any tips for how to cope? I feel like I'm going insane. I used to enjoy showering but now I push it back as far as I can and I don't take more than 15 mins, I'm not even shaving my legs anymore because it's so uncomfortable.