Had the worst possible day at work today

I told them that I'm seeing my doctor next week and then I'm off for a week and I just might not come back. I'm tired of working short in the office. I was told that it was up to me to find someone to replace my co worker while she was pulled up front to compliment their staff. I lost it and that was when I told them it wasn't my job but our mangers job. I'm tired and sick and tired of the non sense that is going on in the office. We will have to see what happens tomorrow.