I can understand your concern, especially when you are not there. I came home to find my cat in a coma. That bothered me and it did do some damage at the time. She lost part of her eyesight. I did the kero syrup too.
Luckily I was home at the time.
One time I was not home and was working and my spouse called and asked what I did to the cat. I went
What are you talking about? He told me her condition and she was starting to go into a coma. That was my fault since I did not take the time to explain everything to him. But, what I had told him apparently he was not listening or he would have known.
The hardest part for me was deciding when was the right time to put her to sleep. Of course I asked others and of course they would say you decide. I feel I made the right decision for the time. That was hard though.
I know anethesia is hard on them but what better place to be than right there where the vet. is when it is done. That is how I looked at it with myself and a surgery I had to go through. There was a high chance of a certain complication but where better to be than on the operating table with where the doctors were already.
Still keep us posted because I care and feel for you and your cat.