[Dorienne]

Well, I'd go with Billfred's third comment. Except, you do it yourself. I think you should have a team meeting without the teacher, and decide what you all want to do. If you want to have someone else run your team, then discuss this with your teacher, then go to teachers you know well enough and ask them if they would be the advisor for you. I'm sure there are other teachers that would love to do it. We had the same problem in 2003, when our teacher left the school. Another teacher was very kind and decided to take his place. We are very grateful to him.
Don't worry, I'm sure things will get better and someone will help you. Good luck!