What could this be std or sti ?

hey guys so i have been to the clinic a while back i had an encounter with a lady and was 2 days later i was discharging and penis was burning especially tip of urethra first time i went they checked for ghonnorea chlamydia hiv and syphillis said i had nothing it was 2 weeks in so i waited another 2 weeks and was tested for ghonnorea and chlamydia again negative what they said i had was NGU prescribed me mextronidazole to take 4 at once then Doxycycline 2 times a day for 7 days througout all this time everything had calmed down i stopped discharging but there was still lots of pain at random times i assumed from scarring since most the damage was in the urethra but eventually the pain went away and things got better recently about a few weeks ago i had sex again went out then to come back when i went to use the bathroom there was discharge but since then i never again discharged but the pain has been coming back slowly the other day there like like a raised line but then it went away on the head of my penis but then went away but its back now whats going on ? need help

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