Urinary problem. To treat this problem?

I am male age 27 suffering urinary problem since 2-3 year.. frequent urination and sometimes urgency..pressure and discomfort in penis region and burning sensation in penis...bloating of stomach and pressure and tenderness below belly button sometimes tight jeans cause difficulty..pressure and discomfort increases when bladder filling and feels better and relaxes after bladder emptying...pressure in penis region when more urine is in bladder and pressure reduces and feels better after urination then after sometime after 1 hour same pressure and disconfort increases and feels relax after urinate..everything is ok but i cant hold urine for long time like during exam time and when i go to market i find toilet to urinate and feels relaxes and normal after urination..urinalysis and ultrasound report is normal and urine flow is also good no bactaria found in urine reports are normal...i want to know which disease i am suffering suggest disease name and what should i do to treat this problem