Prima,
I am no doggie expert, but, I think non disended testicles are pretty dern common. So, freak not, little freak. As to Mick'ster going crazy at the vets...not uncommon. He might have been picking up on your anxiety. So, ten deep breaths, use the time to make Mickey's special area all fresh and clean, and your pupster will be home before you know it!!
Hugs,
Johanna