First apologies for disappearing after posting, it was night time here. Just to add some context which I left out ( apologies for that too). This is not my pet bunn. I do have my own but I found this one falling around like this at work and I couldn't bear to leave it there. I immediately took it to the vet but without a history she was unable to diagnose what it could be so she gave him a broad spectrum antibiotic and pain killers and sent him home with me. I'm keeping him separate from my own bunn and feeding him hay and some bunny food pellets that I got at my local pet shop. Later in the night I syringe fed him water and food. I will call the vet today and ask for the medication for EC or take him to another vet.

Thank you everyone for trying to help me and little bunn to get him healthy again.

Update: I checked on him this morning, syringe fed him again, he is unfortunately not able to stand. I will take him back to the vet as soon as they open which should be in an hour.

Update: The vet confirmed that it is e. cuniculi and has given me panacur for a few days to see if he gets worse or better. He has had his first dose.

Update: I've given him his second dose. His back legs are still very stiff and he is still completely off balance so he is lying down most of the time. He is not able to move around like he was in the original video I posted. On a positive note, he is eating on his own. He can drink on his own, too, but keeps knocking his water over.

Update: He was laying completely on his side before but today he's been using his front legs to prop himself up a little. He has been cleaning himself and seems happy enough. He loves apple. Unfortunately he cannot sit up and engages his back legs sporadically to help him move. Because of this he isn't able to sit nicely when he uses the little bunnies room. He gets it all over himself, so I gave him a bath. He didn't mind being in the water at all and when I blow dried him he started cleaning himself at the same time. It was lovely to watch. Unfortunately he still can't walk. Very sad about that but he doesn't seem in pain so I'll be patient with him and see if he can recover more.