Hi. Greetings. Yours seems to be a complicated case with enormous history to rule out and see the rash if any. I would not treat this on online consultation rather suggest you to see a dermatologist near you. However, an important reason for itching could be just the dryness of skin due to age and multiple medications. Please use a moisturiser like emoderm cream daily. Hope this helps. Warm regards. Dr Govind Suresh Mittal.