intcontinuancy of urine

whenever i  take something sweet ,

the next day I find it difficutl to pass urine.I feel like I am not able to open the track to pass urine.Though I have the urine urge , which comes quite frequently I am not able to open up for the flow to come up.I keep struggling and pass little urine.This happens .When I have heavy stomach full food, then this opening of the passage becomes easy and I pass little comfortably.And after haeavily masterbation (masturbation) also ,I have this same problem.
But this symptom goes after  three to four days.
Though  , I am not diabetic, I am having little higher sugar levels.

For this reason , I never have anything sweet. I went to urologist and he did cytoscopy and ultrasound.Everything is normal .
he suggest bladder neck and he has given tablet 10 mg alfusozin for six months.I dont find this improving...