What are the possible causes of frequent nightfall and urinary irritation?

I'm having urine related problems lately, have too frequent night fall, after nightfall and ejaculation my urinary track end part inside penis feels kinda itchy, irritation goes off after sometimes or after urinating 2times, O get excited too early on sexual matters can't stay relaxed around my partner for too long penis gets excited without any reason or sexual feelings and on slight sexual feeling it starts leaking watery sticky liquid which just kills me from inside. I had been premedicated before had taken Frenxit and Urokit solution for a month which relaxed me for the timebeing about 75/80percent of the problems had gotten rid of but now after having night fall on rapid basis the problems started again, my medicine course just ended 15days back, i have no problems on my report relating to urine, diabetic, kidney everything is normal according my report just my urine PVC is 14mm.