My heart goes out to you right now, I absolutely know how you're feeling as I battled long and hard for a whole week to get Barclay right again after he fell ill with the same affliction as Lucky. I know your pain. You have my prayers and thoughts and it took a lot of guts to take the risks that you did to help him - you were very brave and I think you did the right thing throughout the whole process. On Barclays x-ray there was some damage to his tooth in that area or something to do with the bone not joining up so I believe your vet is right about some kind of tooth infection. Even my vet said the same and the eye simply had to come out there was nothing else for it. I don't believe Lucky or Barclay were in any pain, as they were dosed up good on meds and just peacefully drifted away. I hope you will rest and nurture and look after yourself as you go through the grieving process after such a mentally taxing battle. You just need to put yourself first right now. Thinking of you xx