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First off, thanks for reaching out. Secondly, take a deep breath. Often times things are worse in our heads than they are in reality. Obsessing over what *could happen* will only add to your anxiety. You have decided you are done. Now, think proactively about what you will do with this new decision. What will be different? How do you plan on approaching work differently? What course corrections do you want to make, and how will you recalibrate to be better at your job?
Thinking about these things will help get your mind in a better place when you meet with people at work. You can't change your past. But you CAN change your future. And even the worst case scenario (disciplinary action), isn't the worst that could happen. You have new insights, a new way you want to be and act. Focus on that.
More to say, but my little people are up and I need to get breakfast on the table. Sending you good thoughts. Keep us posted.