I'm so, so sorry Marley. That's a terrible blow.
As happy as I am to have my own place for the first time, I don't think I'm ever going to feel 100%, as it has come at a huge loss. I can't keep my baby kitty here and it really sucks. While your loss is obviously much more painful, I can sympathize with the feeling of having furry friends suddenly gone from your life At least I can still go home and see her though, and after reading what you have gone through, I'm going to try and remind myself of that when I start feeling sad.
I know how it is to wish you could save them all, but sometimes it's less about saving and more about giving love and the best possible care. And I'm sure these little kitties had no shortage of love from you.
Hugs.