Should I put my bunny through surgery or put him to sleep?

I know ive already asked this question but i forgot to add some important info

my rabbits almost 9 years old , hes got arthritis , a problem with his urinary tract where he gets urinary sludge seems blind and deaf and also had heart failure due to an accident a while ago

Last year he got pastuerella ( snuffles ) which then after weeks of antibiotics, became dormant and was carried in his blood stream

The other day I found a big lump under his chin, took him straight to the vet and the vet said it was a pastuerella abscess , which is an abscess caused by tissue that's been damaged and then being attacked by the pastuerella bacteria in his blood, the pus in the abscess is extremely thick and gritty, the vet couldn't extract any pus when he tried

He said that antibiotics won't fix the pro blem by themselves and that surgery will probably be needed, which my rabbit is basically too old for , and the vet says that once my rabbit damages more tissue somewhere else, an abscess will most likely form again

So do I

1. Give him his course of antibiotics along with cuddles every day and plenty of treats and then put him to sleep if the antibiotics don't work

Or put him thru surgery which means he'll be in a room with barking dogs all morning, have the abscess removed and run the risk of him not waking up, or waking up, being in pain and probably getting another abscess