My sincere condolences. Losing our best friends is so difficult. I have 3 indoor kitties and 3 semi-ferals that hang out on our lanai. I’d even miss the semi-ferals.
Oahu has lots of kitties here needing a good home! When you’re ready again, I know some good people who rescue kitties if you don’t want to go all the way down to Kaimuki to the Humane Society.