Gonorrhea would show up normally within 7 days and herpes within two weeks so I think you can rule out any STDs on this one.
Ok. And std dued to sex(oral) appears right after few days or weeks later? I' ve been putting cream for 5 days. It's better but not ok.. Very itchy..
HIV questions should be posted in the HIV forum my friend. Being givin oral sex is very low risk for any STDs. The only ones possible to get are gonorrhea (small chance) and herpes but again this is also low risk. I think you should see a doctor if you haven't already but he'll probably advice an anti fungal cream. Candida and balanites aren't STDs by the way.