Thanks for sharing your story. One thing I do to shift pouch activity to non-sleeping hours is take Lomotil at bedtime (some folks prefer Imodium), but typically not during the day. Your pouch is still young, of course, as is your experience with it, but over time you will likely get to the point where a non-urgent sensation at night seems less threatening, and thus less likely to wake you up. When you do wake up, take a moment to consider whether you really need to go to the bathroom (yes, I know that can be risky) vs. just having the unfamiliar sensation of an incompletely full pouch. A small fatty meal at bedtime (e.g. a spoonful of peanut butter) can also slow down the gut a bit. Your appetite may have calmed down partly because you are no longer starving.
Food choices seem like an obvious thing to focus on, but for lots of folks it doesn’t make much of a difference. I’m not suggesting that you ignore signs of a food sensitivity, but rather that you consider the possibility that you might not have any.