Losing my mind. Yup. I always see movement out of the corner of my eye that is actually a curl of hair that looks like the shadow of a person, or light on the ground that I take for someone bending down with their white-sleeved arm to pick something up. It's never what I think it is first off, so I don't really trust my senses - like today when I searched my bag for a company card and couldn't find it AT ALL and then later when I reached in to get something out, the first thing I touched was the card. I MEAN HOW.
Thus a fear of losing my mind.