How to deal with a loss of a pet

an

Last weekend I had to put my 15 year old cat down and she had cancer

I know I will be adopting 2 kittens soon

This week at work I’m not functioning right at work and plus I’m dealing with stuff with this one girl at my family business making my life really bad trying to ruined my life too and the stress of work and losing my cat I don’t know how to deal with it my whole body is numb from this