<human>: Provide a brief overview of the text.

Basically, I've been sitting here making myself sick with anxiety because of this upcoming meeting today. A few weeks ago I finally broke down and told my manager's supervisor that my manager had been picking on me and treating me like shit. I sent the big boss a very eloquent, fully detailed email in regards to the matter and met with her later that day.. she hadn't read the email yet. I briefly summed up the email to her in the meeting and she decided to pull in an extra higher-up and my manager to sit down and talk about it. My manager wasn't there that day. Fast forward a few days and here I am, about to go into work to this meeting. 

I've literally worked myself up into a vomit-frenzy. I'm considering quitting despite KNOWING that I did nothing wrong. I hate these types of confrontation, much less with three of my superiors in the same room. I've tried going over all the things I intend to say, and possible ways the conversations could go, but I don't know the extra bosses well enough to know what they will think about the whole ordeal. 

Also, my manager has been with the company 10 years. My first anniversary from being hired isn't until September 23rd. I'm such an idiot for even complaining, but it had gotten to the point where she was writing me up for completely bogus things that never even happened and I have proof they never happened.

What to do? I don't want to quit, but I'm scared.
<bot>: I'm a chickenshit because my manager has been bullying me, and I don't want to go to work. Considering quitting.