Sometimes when you do this, you will come to a potentially reassuring answer about all the logical reasons why you are probably not going to lose your job. When you come up with that answer, it alleviates the anxiety, but only very briefly. This is the short-term avoidance of uncertainty.
But it is only reassuring for a moment because your mind can always come back and say, "Well sure, but how do you KNOW you're not going to lose your job?" But because the very nature of the situation is that it's uncertain, you don't KNOW you won't lose your job. So now you're right back where you started with uncertainty triggering anxiety again. You'll probably go right back to trying to analyze it again to try and convince yourself that you can be certain you won't lose your job.
If this worry process becomes so frequent that it seems like it is happening all the time, we call it Generalised Anxiety Disorder (GAD). The main characteristic of GAD is excessive worry about any of a number of different topics. People with GAD overvalue worry behavior: they believe that worrying is necessary, important, useful, responsible, and safe. They believe that it can prevent bad things from happening. They commonly think things like, "If I don't worry about losing my job, I'll miss some key thing I can do that would prevent it from happening." And, "If I worry about losing my job, at least I'll see it coming and be prepared."
The solution to fear of uncertainty is to purposely leave worry questions unanswered, unresolved, and uncertain. This type of anxiety gets better by tolerating and accepting uncertainty, ignoring worry thoughts rather than attending to them, and moving on with what you are actually doing in the present moment in spite of uncertainty.
To GAD sufferers, this often feels like sticking your head in the sand and letting yourself be purposely oblivious to things that could hurt you. But that's actually what works; if you tolerate uncertainty rather than trying to eliminate it, your brain eventually learns all of the following: Uncertainty is not dangerous; it is tolerable; Worry behavior is utterly pointless. It does not stop bad things from happening; Worry behavior causes you more suffering right now and does not save you from any suffering; Uncertainty does not require your attention.