Maybe try finding another small animal vet in your area one that might help more then your vet does now. Even if you find a vet that is very good but lives far away maybe they could recommend another vet or even give you some help over the phone.

Find a clinic that takes emergencies and bring him in asap, he needs to be assessed again and to be given fluids and meds (pain meds, motility meds, simethicone for the gas, bacteria for the intestines).

In the meanwhile, you should feed him either Critical Care or similar special products (can be bought at the vet’s), that is ground hay made especially for force feeding. Do not give him carrots or fruit because they are sugary and can worsen the situation. Only give him greens (romaine, fennel, celery, parsley, cilantro, etc), hay and pellets. If you can’t find Critical Care but have pellets made of hay only, you can let them soak in warm water until you get a paste that can be extruded through the syringe.

About liquids, you can admininster him sub-cutaneous fluids by using a 10ml syringe and a butterfly needle in the size for children to slowly pump into him saline solution (bought in pharmacies). For my bun that weights 1,8kg, the dose is 8ml once a day. I would advice to ask the vet first, especially if you need to know how to do it (where to inject, how to, etc)

Also, massage his belly regularly by gently making rotating movements with your fingertips, better if with his butt higher than his chest. That will help expel the gas and stuff move around inside him.

But please find another vet as soon as possible! He needs immediate care, since he’s been in stasis so long without improvement

I’m questioning “GI issues” if he is now showing neurological signs. I would take him to a different vet if possible.