Oh yeah, I know what that means... I have rather extreme OCD and every single thought and every single step I take has some sick meaning for me. And the intrusive thoughts are either about my single action causing irreversible damage on a grand scale (logicaly, I am perfectly aware it will not be so) either some constant delusion about the fact that something I think is wrong in itself (I study Philosophy, so I have plenty of material to inform me). Unlike many others, I have never taken any medication at all even though I have recently been offered and (i believe, wrongly) diagnosed with Schizotypical personality disorder... It is hardly bearable at times, but otherwise I manage to cope by playing with those thoughts so that they are turned harmless is some dialectical way. Or I simply try to tell myself that it's all biology and no methaphysics.