Ice. I "suffer from itch" (the quaint medical phrase for We don't know why you itch so badly) and really, ice is the best. I have a lot of those soft keep-in-the-freezer things, and a lot of sandwich-sized ziplock bags, and have slept with ice - just double-bag the baggies or you wake up all wet half the time.

I have tried ALL the anti-itch creams, drugs, and mental therapies, and ice is really the answer.

But I agree with the above that you should hie thee to a better doctor, or at least a different one.