What Causes Penis Discomfort And Urine Fullness In The Shaft?

Hi, on June 2nd of this year I got oral sex off a foreign girl I didn't know. Early in July I began to experience frequent urination and a bit of redness on the penis head. I went to the doctor and told him, urine tests came back clear, he then sent my bloods away for tests and they came back clear as well. On a couple of occassions clear discharge came out of my penis during the night. Doc put me on Zithromax 4 tablets in the one day. Then I went for an STI test, nothing showed up in that either. In early August I was still experiencing a more frequent urge to urinate and I noticed my penis was bending a lot to the right when flacid and when erect a slight bit bent to the right so I went for another STI test and nothing showed up there either. Went back to the doctor again and he told me my penis was fine and that I was only imagining things but I told him I wasn't so he arranged an appointment with a urinologist for me. The urinologist told me it was nothing to worry about and put me on Truoxin and some other tablets beginning with Dy??? for 2 weeks and 1 month respectively and said he didn't think I'd have to come back to him. These tablets did make things a bit better for me but Im still not right. When I wake up in the mornings I am bursting and its uncomfortable to try hold it. Then later in the day it feels as if there is urine trapped in my penis shaft. I am going back to the urinologist for an examination of my bladder tomorrow but Im really worried.

Waht do you think???