Have you ever dealt with the fear of getting fired?
Yes, I purposely confronted an employer in writing about his practices relating to employee payment and abuse of power (bullying staff). I was told quite bluntly (verbal, bullying tactics) that I would be fired on multiple occasions, and was formally asked to resign in writing.
What would you do if that fear comes?
I think that the whole experience helped me understand a bit better about how I valued the concept of a job in relation to my whole life.. essentially I got over it. Also I was able to garner from my employers behavior that it was unlikely that I would be fired and he was just looking to intimidate me into leaving for an alternative job in the hope that he could avoiding paying me a substantial amount of backpay.
What would you do if the idea comes true?
Well it didn't, I got paid what was owed and ended up with a reasonable relationship with the employer and left on good terms later on, because I wanted to, and without pressure.
However, I think in my country at least there is always a way to make money - and this wasn't a particularly wonderful job so I could easily have found at least a temporary alternative quite quickly. Its probably easy to feel like that's not possible though even here in a country with a lot of options.. but that's a bit of a trap, as soon as you feel like you need something, be it a job or otherwise, that thing owns you and you will start making "protective decisions" to make sure you can keep it. This seems like a good idea but really its not, there needs to be an assertive growth strategy for all areas in your life.. managed risk, in order to progress. One thing I learnt from that employer (and his relationships with quite a few of the staff there) is if you communicate that you can't afford to lose a job that's a great way to invite a boss to abuse their power, and allow them to totally control you.
And as lloyd said, be looking for another job if you think one is going to end.. and in turn, even if you don't think its going to end - be looking for a better one anyway, or be developing your skills in order to be able to attain a better one. Through doing that you become highly employable and you're less likely to be fired anyway because you're more of an asset to your employer.