Benadryl, I usually take 2, but it may make you very drowsy. Or you can take 1 claritin a day, but I don't know if it works as well. I've only taken claritin once.
Benadryl is the best H blocker you can buy over the counter and should hook you up nicely. Using Ice Packs on the affected areas will help to alleviate the itchiness while you wait for the beny to kick in. If your hives are stress induced, look for ways to cope with that otherwise they will continue to come back.
Only thing that ever worked for me was taking 4 Zyrtec (an excessive amount, but was recommended by my doctor at the time and prescription, so probably not the best alternative)
Benadryl probably the best alternative for an antihistimine.
You can try an oatmeal bath to help with the itching.
Hives suck soo bad. I feel your pain. If possible, find out whatever the hell gave them to you and avoid it like the plague.
Took me months to figure out mine were caused by Ibuprofen.
Benedryl, oatmeal bath or lotion, or baking soda in your bathwater, I have a pt. that itches to no end and the soda water bath and oatmeal lotion helps him tons.