go speak to your doctor and see if he thinks co-dynomol would help.
Buy its then into the no-fly range of drugs.
Strangely enough I was using a anti dandruff shampoo called selsun for a skin fungus infection at the time of the last time I got CP. And it seemed to help with the itching.
But I will bow to those that know if this was just a random fact that my nuts stopped itching after I used it.