Itchiness is sometimes a sign of a fungal infection, which (if you have it) can drive you crazy. Sometimes, though, itchiness is just a variation of pain. If things tend to be damp there (e.g. if you have some leakage) and the itching is external then you could try a topical anti fungal.
You may see some more improvement from the Proctodan - I’d give it more time.