Lotions, showers don't help. Mom complains that her legs and arms are always itchy. Nothing helps. We have been to dermatologist and she didn't find anything wrong. Antihistamines don't work and I think one of her medicines is causing dry mouth, so I removed the suspected prescriptions for a week. I think she's paranoid. I don't know what else to tell her to do.
Are there liver issues? Kidney? They can cause. There is a soap called black African soap.it works. It is about 5 bux. The soap is black. The lather is not. I had a massive stress related itching thing, eczema. Awful. Between diet,the soap I named and sarna lotion I prevailed. It has never come back. Good luck. I feel for the scratchy and itchy.
You may want to consult a psychiatrist.