Hi, what You've described sounds like a pretty typical OCD issue. I'm sorry your doctors didn't help you...seems like OCD is really difficult to treat.

All I can think of is using an image to replace the unwanted thoughts exactly as they come up. For example, you hear a benign word and before your mind has the chance to act on the OCD behavior, imagine a stop sign. See it in your mind...red and white, and a big STOP.

Mindfulness meditation could also be really helpful for you. The Skeezyks here on PC has a good link to mindfulness information. As soon as I 'see' him I will ask him to post his link on this thread.