I completely understand. My hubby has been laid off since Christmas eve and right now I am the only one working. We just had to put our 10 year rotties down and it was during the time the vet was closed, so we got an emergency fee tacked on to it. Thankfully though my vet will let me do payments with them, but then I have been going there for about 30 years (including childhood with my mom).
Has you given him a flea bath? Those really help as well.