All of a sudden i have started getting this itching all over my body. I guess it was after i used a blanket with lots of dust in it for a period of week when i out. It sarted with the area behind my ears and neck and now it almost covers my entire body. I consulted a dr and my first dr gave me the attached prescription medicines. I was relieved from itching as long as i was on medication. So I changed my dr, he gave me cetirizine which again releived to a greater extent but only untill i take it. I have no fever or anything else and its been almost 3 weeks now but the itching does not go. Any suggestion on any blood test that can be done to check this.