I don't keep house snakes, but my hogs and knoblochi kings (and rosy boas, though to a lesser degree) will alter their feeding habits or go off feed from time to time, I suspect for all the reasons you've listed. I have a lone male ball python, too, who has gone off food for up to 9 months, with no apparent ill effects and with no apparent reason for starting up again. He's been with me about ten years and I'm still learning his habits.
Hopefully someone who keeps house snakes can chime in here and give you some specific pointers.
Keep looking for info, and keep learning, but try not to get worried about feeding peculiarities. Snakes are funny critters.
