just2b, being 'consumed with being fired' feels awful, I know. It also can interfere with your focusing on your work. It is very hard to let go of the thought, and it's scary too. But it tends to get scarier and scarier and more and more interfering if it gets hung on to. I am not criticising or judging, as I just went through something so similar. An 'emergency' session with my therapist helped, and facing what I was trying to avoid helped too.

I wish you some peace of mind and much success on your job. I know you can do it!