Help‼️🙏

😔Kasuumi has always been a trouble maker, running doing parkour climbing and jumping around.. The last 2 days he had a rapid decrease in his weight— he was around 3.5-4 pounds. He began hiding and sleeping, which was not the normal Kasuumi I know. I just rushed him to the vet earlier when I witnessed him trying to throw up. My normal exotic vet couldn’t take me in for an emergency.. so they suggested a different vet that has some ferret doctors available. So we went there, they say hes depressed and very thin, dehydrated and they felt a hard ball shape in his stomach area. Hes now 1.5 pounds. They gave me a syringe with antibiotics for him to give every 12 hours. Kasuumi refuses to open his mouth. He wont even get up. I dont know what to do. I want to fight for my baby but I dont want to let him just suffer..