I had testicular pain (especially left side) my whole life, and last year, i saw a urologist - he diagnosed a varicocele, which is a painful, almost numbing varicose vein in your scrotum. I had surgery and have had no pain since.
Hi, what is your age? Many things can cause those problems.So to narrow it down go to doctor and he will be able to tell you.I dont think you have anything to worry about ,so dont stress to much!Good luck.