Man I’m sorry to hear that. I’ve been through it several times and it doesn’t get any easier.
I’m not an overly emotional person but the poem the rainbow bridge made me cry and feel better. I’m not religious. I’ve never had faith but I’d like to think if there is a “heaven” they’ll be there with me.
Adopt when you are ready. You can’t replace what you had but you can provide a home to another animal that needs one. It won’t be the same but different in a good way. I had friends who said it’s just a cat when mine passed but they don’t get, they’re more than just cats.