I'm so sorry for your loss. We lost our dear Odie a year ago, and although she was very sick for the last 6 months of her life and we knew it was just a matter of time, her passing was not any easier for that knowledge. We still feel her spirit kicking around the house, and we remember how much she meant to us, and the memories are now sweet rather than sorrowful.
I hope you find yourselves healing over the next weeks and months and leave your hearts open to new loves and maybe you'll find another kitty to give you happiness.
Fluffin, Sounds strange but I have seen her several times in a shadowy kind of way, and my husband (who doesn't really believe in these things) has felt her jump on the bed and also whisk her tail around his legs when he is sitting at the dining room table, you look no cat!