I also was diagnosed with PCV just this May. I had the horrible itching 2 years before my blood ever showed signs of the disease. I went to many dermatologists and have found if I take a chewable children’s Benadryl it calms it down and usually takes the itch away. Bathing is the worst, but sometimes I find stress triggers it. I also go for a walk or exercise and that helps me. It’s a battle.