I'm Scared, My guinea is sick and possibly dying Options

[Houseki]

I just moved out of my parents house and yesterday i finally brought sage my guinea pig to the new house. he won't eat or drink all he does is sleep in his house. he's 4 and a half years old and my best friend i don't want to lose him but if this continues he will die there's no guinea pig vet anywhere near where i live and it feels like i'm just sitting here watching him die i'm constantly depressed cause there's nothing i can do i feel helpless like i did with my hamster who died slowly i suffer from depression outside of this and i'm scared because i have alot of troublel dealing with death i don't know if i should put him down or see if he gets better but he's been like this for 3 days i feel numb with the thought of losing him even though i knew it would happen eventually given his age