Have you ever worked for someone who is so volatile that you don’t know if they are going to be mad or happy when you get to work?

My boss is like this. He gets all amped up on caffeine, and he’s either really happy and nice or he barks out orders and acts like you aren’t doing your job when you are.
Yesterday and the day before it he was doing this with me. Telling me to do one thing, when I was doing something else. Not explaining what he wanted us to do and when I asked for clarification, he gave me a tone.

The way he has treated me over the past week or so has been so bad that I actually plan on meeting with HR about it today. I documented my experiences and talked to the manager last night about it.

The problem is that I couldn’t sleep last night, and I feel ill right now thinking about it.

Have any of you been in this situation? Someone treats you or talks to you in a way that’s so rude, you are forced to do something/say something about it?