Have Itching On The Penis Along With Pain During Urination. No Medication Now. How To Get Rid Of It?

I feel like some itching sensation at the starting and bottom side of the bladder. Since few days, if I pee after few hours, may be after sleep, it's paining. I go to Gym regularly, soooooo I used to take whey protein but never felt any as such but recently about 3 weeks back I started amino tablets. I also masturbate veryyyyyyy often, almost daily. Sometimes twice a day and sometimes even thrice.. Please give the solution to reduce this