Could pain in your lower abdomen and testicle be linked to Strattera?

Yes. I had the same thing happen to me. I was checked for a hernia by four separate doctors (not fun), had my prostate checked (even less fun), and was told flat out that they had no idea what was wrong with me. I stopped taking Strattera, and the problem went away almost immediately, along with a number of related side-effects. It seems to be very, very rare, and is not officially documented anywhere, but I've found enough brief personal anecdotes online to make me believe that its true.

Another user:

I also suffer from significant testicular pain upon taking Strattera. To test this, I stopped taking the medication and it went away immediately. I stayed off of Strattera for four days and had no pain. Last night before bed I took Straterra and awoke to significant testicular discomfort this morning.