I Have Had Wat The Doc Called Trich, He Gave

I have had wat the Doc called Trich, he gave me Trinidazole and after course no change. This went on for 6 months and no change and then I changed the Doc and still same result. Wen I take the medication I have no itchiness in the urethra but a week after I finish the itchiness starts and now I feel pain inside the urethra. Is this resistant to the medication, i have had Flagyl, Trinidazole, u name it. Taken for two weeks. What shld I do? Shld I try Levaquin??