I'm almost certain it's not a pulled groin problem. I've had tons of them and the pain isn't the same as you're describing. The groin muscle goes from right at the top inside of your thigh where it meests your torsoe - right over your hip flexor and attaches at the top third of your quad. Besides, if you had pulled it badly enough, you would probably see a little bruising or clotting around you upper thigh area and would really feel the pain when you stretch to the side or lunge forward. A pain that is isolated around or behind your scrotum doesn't sound like it could be associated with your groin muscle.
It would be great if you could update this thread with the Doctor's diagnosis.
Good luck.
