I don't know what else you could put on it. But, is there a place you can call like an ask a nurse? Sometimes there are those kind of places you can call and ask them questions.
Also, you might call your pharmacy. They might know of a product that would help.
Hydrocortisone cream should be the best I think. Maybe what you are using isn't strong enough? My son used to get it and the he always had to go to the doctor to get medication. Sorry it is so miserable for you. If it is hot where you are, heat and sweat makes it all the worse. :(