How can adult bed-wetting be treated?

I am a 21 years old male suffering from bed-wetting. I am physically active and exercise daily. My problem started some eight months back with daytime involuntary passage of urine. The digital X-ray, Micturating cysto uerhrogram and ultrasound KUB indicates no significant post void residual urine, no evidence of calcification of prostrate, urethra appears normal and there is no evidence of vesicoureteric reflux. I consulted a urologist who asked me to take Renerve Plus every night before going to bed or to get up twice between 10 pm to 5 am and urinate. This helped me initially but now, I am facing the same problem. How can my problem be treated treated?