Okay, bunny update: I brought him to the vet yesterday afternoon. Unfortunately, they don't specialize in "exotic pets" (which is what they consider a bunny - can you believe that? Lots of people have pet bunnies!), but they are the only emergency animal hospital in my area, so they agreed to see him. I brought him in and just for them to look at him it cost $110. They say they think he might have a bowel obstruction or something like that. It can be deadly to a rabbit. They said he was also dehydrated and said they thought he was demonstrating abdominal pain, although I haven't noticed that. This is mostly just guess work though. We are just trying to treat him as if he has a bowel obstruction and see how it goes. He did poop last night. He was so frightened at the vet that he peed (which I was concerned about - he hasn't been peeing like he normally does).
He was doing really bad yesterday. He was very lethargic and not at all like his normal self, so I had to bring him to the emergency vet hospital.
So anyways, they gave me two medicines for him to take via feeding syringe and some liquid food. He LOVES the medicine. He was lapping that stuff up. He hates the liquid food though. He won't let me get it near his mouth. He freaks out. He did eat a couple of strawberries and some Timothy hay this morning. He won't touch his regular food though. I don't know why. I washed his bowl well and put brand new food in there this morning, and he still shows no interest in it.
Okay, sorry that was so lengthy. Anyways, he seems to be doing a little better this morning. Not as lethargic and, like I said, he ate a little bit. Still hasn't peed yet today.
Oh and I almost forgot to mention, so on top of that $110 to just have him seen by the vet, of course I had to pay for the medicines and the food. So the total bill was $190 - and change. I think that is outrageous. They were very nice though and of course they thought Bunny was the sweetest.

I'm just hoping this treatment works. If not, I'm going to ask them for an antibiotic to treat an ear infection and/or a urinary tract infection, because I think it could be one of those things possibly.