[sdwr]

Are you sure the feeling is accurate? You might just not trust your coworkers/feel secure in the environment. There's a good chance you've built up more goodwill than you realize, and the people at your job would be happy to cover for you or at least cut you some slack.

I'd go to your manager or whoever you trust, share how you feel (overwhelmed, afraid of being fired), and listen to what they say.