Hi, sorry to hear about your cat. I had a pet who died a few weeks ago, and at first I couldn't stop thinking about it. I found it best to just remember the good times, and how much you cared about him. There are some websites which help too :) message me if you need to.
I am sorry about your cat. It will take time to come to accept that you lost your little furry friend. I understand how you feel, I love my cats its quite like taking of 2 furry kids. Sometimes we get very attached to that unconditional love that are pets offer us. Like any attachment it can shake the world to suddenly realize its gone. Sorry Hun but the only thing you can do now is try and distract yourself until enough time passes to let you come to terms with your grief.