Glad to see you've got cecals!
To help you figure out how your rabbit is feeling, some people choose to offer their buns a very special treat once in the morning, and once at night (12 hours).
For my guys, it is a single Craisin. They only get 1 in the AM, and 1 before bed.
If they don't go completely nuts over that Craisin, then something is wrong, and I treat it as an emergency.
This system might help give you a safety net for judging your bun's health status.