I could be hernia? I would have your dr check for that.....
Torsion would be something to be worried about, but that pain usually wouldn't let you even move without an unbearable pain. You may have also suffered from some sort of trauma, even if you don't remember. You might have gotten out of a car wrong, or did something while exercising or something like that. I know I had some pain in my testicle a couple years ago and after a couple of days on pain medicine and muscle relaxers, I was fine. I was also told to start wearing better support than the loose boxers I had been wearing.