I have nothing to offer as far as physical detox, but I was happily surprised by this...I got hooked on benadryl and other related antihistimines as sleep aids because I was having ahard time sleeping due to anxiety.
Part of the anxiety was the result of vivid disturbing dreams...turns out the antihistamines were causing the disturbing vivid dreams...so getting off of them had the added happy side effect of ending those anxiety producing dreams!
I had headaches and generally felt like crap, but that's all I recall. It didn't last very long.