I am suffering from cold urticaria since six month. I was prescribed many medicine but they don't work at all. I want permanent cure from this disease.

Cold urticaria. So does everyone with cold urticaria, one of several "physical urticarias". It is usually very bothersome, usually doesn't involve the respirator tract and can be difficult to control. It rarely can be associated with cold agglutinins a possible marker of more severe underlying disease. See a board certified allergist for evaluation and treatment.