I am having the worst day?

Hey, I'm sorry to hear that. Sometimes everything can get a little too much. I would suggest getting a warm drink, and just sitting for a while and try to be calm. Have you spoken to your sister yet? Maybe call her if you can and have a talk with her, that will make you feel better. Then, get your boots on and head out and look for the kitty. One thing at a time. Good luck.