Basically I am having burning at rest/after urination symptoms, lower abdomen discomfort, frequent urination in 15 Feb then i visited doctor on...21st Feb he gave me oxyfloxcin 200mg twice daily for 10 days the symptoms reduced significantly except frequent urination and then testicle ache/discomfort started on 28th Feb then again on 2nd March I visited doctor again he then gave me doxycycline 100 mg daily once for 15 days , after that all the symptoms reduced significantly by ~90%. but on 7/8th March the symptoms started again like fluctuating then on 14th March I visited urologist he then gave me levofloxacin for 10 days the symptoms reduced but starting fluctuating again on 21st Feb I did urine R/E test it was normal and then on 24th March I did USG- whole abdomen test : it showed 4.2mm non obstructing left renal calculus and UB wall thickening ( cystitis) i had sexual exposure on 23rd jan ..so I'm worried about STI what can it be?