Hi fellow Connecticut corn keeper.
Yep, it sounds like the snake is nervous. That crapping/musking business is usually a defensive measure. Corns are sensitive to a variety of stress agents. The fact that the snake is still eating and digesting is a good sign though. The key is figuring out what is causing the stress. Here's a list of possibilities:
1. Cage conditions: does he have appropriate places to hide? Is his enclosure in a high-traffic area? Are the temps where they should be? I'm assuming that he's not being housed with other snakes. If he is, that can be a stressor. I was just musked this morning by a corn that has never musked, even when she was a hatchling. I brought her with me to a house she's never been to, where there were dogs, and myriad other unfamiliar scents. She's usually in a rack, but her enclosure was out in the open last night/this morning. Something set her off.
2. Odors: is your family/son using any new detergents, soaps, body washes, or perfumes/colognes? Any new pets in the house? I bought some Vaseline Intensive Care Aloe hand lotion that my snakes HATE.
3. Miscellaneous: can you think of anything, including the items listed above, that has changed in your household around the same time that this behavior started?
It may be unpleasant, but I wouldn't recommend ceasing all handling. Be gentle, and keep the sessions short. Do not return the snake to its enclosure immediately after a musking/crapping incident, or the snake may begin to associate this behavior with a positive outcome.
Good luck.