My very sick cat

He has a cancerous tumor and the area around the tumor is infected we know this because we took him to the vet today . He hasn't been himself lately . So he is on some meds and has to wear the cone collar to keep him from scratching it open more. I am really sad due to the fact his is mine best buddy. The vet said if the tumor doesn't go down well we will have to put him down because we can't afford 2 grand to make him better the surgery will cost 500.00 then we run into the pathologist report them the other meds to help him out .