Urinary tract infection. It repeatedly.

Hello, I have been suffering from urine inconsistency since 4 years but it's not on regular basis. I consulted doctor few years back and came to know that it is UTI and suggested medicines accordingly. After usage of medicine for few days, I got relief from infection. Again i am facing same issue where I am spending lots of time in washroom just to urinate as urine keeps on flowing but there is no leakage of urine when I come out of bathroom and I don't get up frequently for urine during night. I don't have diabetes. Is this due to anxiety or stress, if yes how should i control it. I am married now and while doing sex I feel the urge to urinate. This infection is quite  irritating. Please help me identify the correct issue and to which doctor i should consult and what tests need to be done. Please let me know if this is a serious health issue as I am facing it repeatedly.Thank you.