I would ask the vet for fenbendazole and metacam, in case this is e cuniculi. Fenbendazole acts on the e cuniculi parasite itself, and metacam is an anti inflammatory (NSAID) that can help bring down the inflammation the ec is causing. Baytril, a broad spectrum antibiotics, has also been shown to have some beneficial effects in e cuniculi cases.
He must eat even if he doesnt want to, or he can’t survive.
Dragging the hind end is typical of ec, especially since he’s presented with this symptom before. The other major cause of hind end weakness and inability to stand would be trauma to the spine, but if that were the case the weakness would not have gone away to present again weeks later.
You need to get food in him and keep him warm to prevent him from going into chock. A low temp is a warning sign that the bun is going into chock. You can give him a bottle filled with warm water and wrapped in a towl, but he needs to be able to move away from the heat source if he wants to.
Treatment needs to start ASAP.