I hate to refer you again, but check out the community addiction forum; there are many recommendations there for non-medication treatment of withdrawal. Immodium is sold over the counter and is a good medication to treat the cramping and diarrhea, but the rest of my suggestions are prescriptions: clonidine, gabapentin for sweats, etc.
you might get more help by posting in the addiction:susbtance abuse forum
good luck
nick