(As you know, we can’t diagnose rabbits here because we are not vets).

This said, if a vet visit is out of the question, I’d try the following things that I do for gas pain:

Simethicone baby gas drops, if you have that. You can give 0.5-1 ml per hour for two or three hours.

Metacam (meloxicam) is very good, since you seem to have that, because rabbits are very sensitive to pain and gas is very psinful for rabbits.

More important than gas drops: Try to make him move around. Dont chase him, but you can pick him up and put him down some distance away from his favorite spot, so he has to walk/hop back to his spot. Do this every 20 minutes or so. He will be annoyed, but you have to keep annoying him. Physical movement helps the intestines move and can help gas move out.

Keep him warm. A rabbit in pain can become hypo thermic and that is extrenely dangerous. Feel his ears if you cant take a proper temp. Cold ears indicate that he’s colder than he should be.

You can warm him up by sitting him in your knee, with a light fleece blanket on him, and let your own body warmth warm him up. He cant get over-heated with this method.

Having him in your lap also gives you the chance to elevate his butt a little bit, so gas can escape easier. You can give a very light tummy “massage” as in Mary S Cotter’s classic video.  https://www.howcast.com/videos/514701-how-to-help-a-rabbit-with-gas-pain-pet-rabbits

This will enable you to feel if his belly seems distended and/or if he reacts with pain when you touch it. If his belly is really distended or if he reacts with a lot of pain at just a light touch, this is a vet emergency.

If he seems very unwilling to sit in your lap, you can give him a warm water bottle wrapped in a towel, but make sure he can move away from the heat source if he wants to.

You can try and syringe him some water or hay tea (to make hay tea you pour some hot water over some hay, let steep and cool and serve the “tea” in a syringe).

It can take several hours until you see improvement like poop (any kind of poop, sticky and stinky or firm), eating something voluntarily and stops looking sad and uncomfortable. You have to keep at it, especially with the annoying him so he moves around.

This won’t cure anything except an upset, painful, gassy tummy, but it’s pretty much all you can do at home. Almost all rabbit illnesses first present as GI trouble.

It sounds like whatever was going on is working itself through! I’ve been in that situation before concerning the vet and it is awful. Bam gave great advice on supportive care, warmth is very important.

It could be either gas, a partial fur blockage, or cecal dysbiosis (or a combo) given the mushy poops. Cecal dysbiosis can cause gas and be very painful. I would probably not give any banana or treats, and just focus on lots of hay. During molting especially buns can be sensitive to added starches or sugars. For the edible chew toys, if they are mostly fiber (like wood, grass, palm plates, etc.) then they should be safe to keep giving, but if they are compressed timothy or something like that then I would remove them for now.

Has this ever happened before with him? I would discuss the incident with your vet when you can get an appointment. It would be good to have things on hand to syringe feed, possibly pain meds and sub-q fluids as an at-home first aid kit if emergency care is hard to get. Often giving buns supportive care early on will prevent things from progressing to a true emergency, and syringe feeding a tiny bit and giving a small amount of fluids can help a lot if given early.