Overworking?

Today I woke up at 6am. I got dressed and packed my bag to get ready for work. Today's a special day. I get the newspapers and greet the doorman. Now I'm off to work. For some reason the train is running slow, it's delayed several times due to train traffic. This has never happened before. I finally get to work and on time. I walk into the classroom. The students are happy, but wonder where their teacher is and if he is coming back. I tell them that he is still alive. I do roll call. We start on the first activity and then do the next. We have a short break and finish off the to-do list before lunch. During lunch, I don't know what to do. Should I act as a teacher or resort back to my tutor position. I answer one question and no one else seems to need me. I decided to eat lunch. The normal teacher shows up and I don't have to fret about having to teach and tutor at the same time. I go to the computer lab down stairs and begin to work with students on their resumes. It's fun. I love doing it. After that I come back up stairs where not too many people need me, but several want to read for me. So I listen and repeat words. It's a relaxing day. Once the students are gone I plan for tomorrow's classes that I have to teach. I make copies and everything is planned out. It's now time to teach the second class tonight. I walk into the classroom and yet again I am asked about the whereabouts of their normal teacher. I assure them that she is alive and well. We get started on the activities and they want to know if they can go home early. However, I push them to focus on the task at hand. We get through everything fabulously. And then it's break time. They don't want one. They want to push forward so they can leave early. I insist they take one. Now they are working quietly and efficiently on their essays and soon we'll go back to the classroom to work on vocabulary and finally leave. They are suppose to watch a movie, but I didn't preview it before and it's not good to show a movie that you have not watched yourself. Overall, if I survive this, I will be glad and very thankful. And if not, I know that I shall never ever agree to sub two classes in one day.