I think I'm going crazy right now.

There are these annoying insects that tend to get into my house in the winter and they buzz loudly when flying. A few minutes ago I thought I heard one somewhere near me, but I didn't see it. Now, every few seconds I keep thinking I'm hearing one buzzing somewhere in the room, or tapping against something as it flies. It's driving me absolutely nuts, my ears are straining and I'm acting like a freak, shining a flashlight all over the place looking for something that clearly isn't there.