Fur baby help

My 3yr old fur baby is in need of an emergency vet appointment, he has this hard ball that has formed on his neck! It started small and now it's huge!! I don't know what I can do! I do not have the funds to cover his medical expenses and the vet consultation are so expensive now days. I've just looked into getting ins but it does not cover any existing conditions. I made a profile kind of like a gofundme but for pets where the money gets sent straight to the vet only problem is I don't have enough social platform or people who are willing to donate. Any suggestions??? Please help me help my Arlo