2 Years ago I was experiencing similar symptoms; left
sided testicular pain and minor swelling. The testicle
was high riding. I went to the ER, was exmamined w/ ultrasound and was diagnosed with epiditimytis. Subsequently, I went to a urologist 2 weeks later after the pain was still there but very very minor. The urologist, after examination, said everything felt normal.
I am again, 2 years later, experiencing similar left sided testicular pain/high riding.