I would drink a lot of green tea throughout the day as another temporary measure to reduce or relieve the itching. That sounds like a serious problem, I hope you figure out the cause and proper treatment. I know that itching can almost drive you insane, I have had extreme itching of athlete's foot before, and also extreme itching of my nose (not sure why) that was only an hour or so, I can hardly imagine 6 weeks. I once got some tropical plant juice on my arms and legs, along with my cousin, which gave us some deep tissue/nerve itching for almost an hour, washing the skin and applying an external liquid barely helped, only after an hour did the throbbing and crazy itching go away, a terrible experience. Who knows what is causing this weird thing, you might consider going off all food and herbs and water fasting, in case it is related to anything you are ingesting, and also topically applying your urine to your skin. Just some ideas, I really sympathize with your condition. Let us know what happens, okay?
~Squeaky