I broke out with a itchy rash on my back, buttocks, chest, stomach, arm and I am a stay at home mom so nothing has changed. The itching is unbearable?

Hives? You already use benadryl, (diphenhydramine) does it help? Take a bit more to see if it helps or, better yet, go to urgent care or er to prevent hives spreading into places it can be much worse than an unbearable itch.