Do you ever do CBT worksheets to work through your irrational thoughts? I have an app on my ipod touch: icbt (there's also icouch, etc.). I'm sure you can find some on the internet. You write down your irrational thought, the emotions associated with it, and the negative thoughts associated with it. Then you write the distortions associated with it (All/nothing thinking, overgeneralizing, etc. - there's a whole list). You then rewrite your thought noticing how you've distorted it. I'm probably butchering my explanation, but I find doing exercises like this about such irrational thought are very helpful for me until I can talk to my therapist.

Good luck!