slightly scared

I'm starting to see things. Always it's out of the corner of my eye. It's a man's figure sometimes, and a face others. I'm also having trouble when I speak. I'll think one word and say another. The words are always related, but different. Today I was talking to my mother and I was trying to say something about a brother. The word out of my mouth was sister. I didn't catch it, but my mother did. I apparently do when I type too. when I started this paragraph I tried to write figure and face. I actually typed fae and face. What's wrong with me?