Mojo needs help !

Mojo had gotten neutered and vaccinated. Well five days after being neutered he started to stop eating and started  Drooling everywhere blood tinged. I took him to the  emergency vet he was running a fever they gave him fluid and recommended an appointment with a normal vet. Well that being said I’d have to run multiple tests which cost 400$ than have to pay for the treatment whatever that may be and that could run from [phone redacted]. So right now I’m broke with the vet expenses already an anything u can donate  will help I’m hoping to get donations quick as we don’t have much time and I don’t know how much longer I can home remedy him his sores are getting bad and he no longer is letting me clean them without clawing  the hell out of me. Please help me and my cat...any thing will help