Genital warts have been known to cause severe itching, despite a lot of doctors saying they don't. It causes a lot of confusion. From personal experience and many interactions with people who have genital warts - it causes itching. Though that is unlikey to cause your whole body to itch. Maybe its an allergic reaction to something, stress or irritation from certain materials which contact your skin. You could try using a moisturiser especially for itching
could just be in your head mate