I had a colonoscopy on Saturday with no sedatives. I only had gas. It was painful, they t ook five biopsies. Five hours after developed itch on abdomen which has rapidly spread into raised non blkanching red bumps and spots, on back also and moving towards neck and face, not the legs. I've been really tired sleeping in day, not sure whether to go back to hospital .itching is uncontrollable ? The abdomen is quite covered rash is/around lower abdomen and breast tissue raised leach like looking rash and lots of bumps and spots?