Thought I would post this to you direct as it's getting a bit personal :).
When I was suffering like that a few years ago in the middle of summer, my Doc suggested using an anti-fungal powder. Not just a prickly heat powder but the type you'd use for tinea etc. It certainly helped me - just make sure you put your knickers on first so the powder doesn't get into any delicate areas and cause even more problems :).
Ⓒ2016 Mark's Daily Apple