It makes me crazy when pets are lost for those reasons. It's not fair pet health care has to come with such a high price. It's just not fair. I know this didn't guarantee saving him and I'm not against vets making a living either but still.
I can imagine the frustration and sadness when it's just impossible to get that money and in the mean time your friend, companion, fur baby, is sick and can't do anything about it.
It happens even with people too in some places people who could get treatment die because they don't have the means to get what they need.
It's not fair to anyone.
I'm very sorry for your loss I'm sure you did whatever you could.
And about getting another cat...
Well maybe give it sometime? To adjust to the place without him being around.
It all depends, everyone deals with these things differently.
" How we behave toward cats here below determines our status in heaven."
- Robert A. Heinlein