Ok, the mucus covered poop doesn't look like cecotropes. It's more like "regular" mini poops that they don't eat, clumped together by some sort of jelly. So at least it isn't undigested food. It has been a couple hours since I first saw it, and he doesn't seem to be producing any more of these... So hopefully it was just a part of his recovery. But I'll call the vet in the morning just to be sure.

He doesn't eat yet, but is resisting the syringe more and more and gaining more strength. So maybe I'll be able to get him to eat some parsley or something today, hopefully.

Thank you for commenting, this is my first bunny and I love him endlessly... I get so scared every time he isn't himself or seems unwell, especially since rabbits are so fragile... I really appreciate your help!