Suggest Treatment For Bladder Infection

Hi. My name is Joanne. two weeks ago I developed a bladder infection. I was prescribed an antibiotic. It was macro-bid. I took this for 5 days and there was no change. Seen another doctor and he prescribed me another antibiotic combined. It worked for 2 days, then got worse. Now prescribed apo-sulfatrim ds 8003trimeth ds and suppose to take it for finished-28 tabs. Its been 5 days now and symptoms are coming back again. What should I do?