I need advice

My one year old cat suddenly stopped eating just yesterday:( I don't know what to do. I'm still a student so I have no money to get him checked sa vet. I'm worried and crying right now kasi ayaw nya talaga mag eat and hinanghina na sya. He's just staring at nowhere nalang or di kaya tulog nang tulog, I'm scared that I might lose him.

Do you have any estimate para magpavet? I really need help he's important to me and has been with us since he was just a kitten:(((

I really need any advice please, I can't lose him