Urine starting problem. Or the nerves?.

I was under medication for tonsilitis for last 1 mnth ... I was given antibiotic(forenza 325) antihistamine (montair fx) antacid(gr8 od and ancool) antidepressants (placida plus) after 3 days of starting of medicine I cannot urinate properly there is urine in my bladder but it's not coming out smoothly I have to give tremendous pressure for 3-4 minutes for the urine to come out.. once it comes out it catches the flow and total urine is removed smoothly .. jst to start the urination I have to give immense pressure ...if my bladder is totally full then I have to give less pressure but if bladder is not enough full but u can feel.there us urine I need to urinate the problem arises I cannot start the urine.normally. my USG KUBP report all normal urologist gave ston 1syrup and silodal 8 ....3 days passed.no relief ...don't know what is the problem.my bladder muscles or the nerves??.my report normal but why am facing this tremendous prblm..plz help.