Good grief I'm sorry it's gone on as long as this lja401.
You must be worried out of your mind.
Noel's liver will be OK if he's eating a little.
Sky-O has lots of experience & is very knowledgeable. I've a bun with big gut problems, for 51/2 years. Let's see what we can do together, to help you.
The 1st thing that comes to mind with Noel is do you have a vet who has specialist training in rabbits, & sees a lot of rabbits?
(Ordinary vets have virtually no training in bunny issues, & bunnies are totally different from other pets. The forum can help to get you to a vet with bunny training if needed)
Noel is being a good boy if his poops are nearly back to the usual amount - he's eating hay = fiber which is the natural gut stimulant.
Top of
my list for this situation is whether he has tiny razor sharp spikes on his back teeth (molar spurs) These make it painful for the bun to eat when they rub on the cheek or tongue. Even using an instrument (auroscope) the top bunny vets can't see the very back teeth well.
Sky-O may well have more possibilities.
ETA is Noel passing plenty of urine? A 1st sign of dehydration is low urine output & it usually gets chalky, forming limescale in the tray very quickly.