One of the cores of DBT is mindfulness. Focusing on the moment without obsessing about the past or worrying about the future. It's not easy, but it can help. Meditation can be part of that. If the weather is nice outside, attempt to take a mindfulness walk. Focus on your breathing, the cool air on your skin, the muscles in your legs tensing and relaxing with each step, the feel of your clothes as they rub against you, the sound of the birds or the wind. Do not force all the obsessive thoughts down where they'll just return to haunt you. When they enter your mind, acknowledge them, "I'm thinking about my job again" and then try to let it go. You may have to do that many, many times but the goal is to not get frustrated and start worrying about your worrying. The goal is to make the amount of time you obsess a bit less over time.

In addition to that DBT website, there's always the chat here on Saturdays and the Yahoo free DBT class.

By the way....what type of kids are you dealing with? I am a middle school English teacher though I'm not teaching at the moment due to our moving. PM me if you'd like and if I can give some tips I'd be happy to.