since you had unprotected sex, you have to follow up with proper testing at the proper times. you can get tested for gonorrhea, chlamydia, ngu and trich after 1 week post encounter. syphilis after 6 weeks. herpes , hiv and hepatitis after 3 months. odds are your partner isn't getting full std testing at the proper times so cover your bases before having a new partner.
have you had your gardasil shots for hpv yet?
your symptoms don't sound like herpes since you haven't had any obvious lesions. make sure they also manually examine your prostate too when you are seen.
grace
Also I have noticed my penis to be leaking urine throughout the day.