Hard to say, everyone is different. You didn't say what your issue was with the prednisone; if it was a side effect, there are ways to manage it. If you have specific questions, I am a pharmacist, so I will try to answer them, just send me a personal message.
If you won't consider the oral steroids at all, then the clobetasol is one of the best steroid creams out there, but you really shouldn't use that for more than 2 weeks without a break. Taking antihistamines can help, since it is an allergic reaction. If you get sleepy from Benadryl, try Zyrtec, it's once a day and less sedating. Good luck, I have had poison ivy and other types of "poison" reactions, and there are horrible!