Trouble concentrating

I've been having so much trouble concentrating lately. I don't know why. Now I'm forgetting things. This morning when I was emailing a customer the dates her ad was going to run I added one day more than what was needed. Then later when I emailed a copy of her ad to sign off on, I forget to attach the ad. And yesterday my mom ask me to close the front door and turn on the light. I close the front door but in that minute I completely forget to turn on the light. And for the past few weeks I've having trouble staying focused at work. It's like my mind just starts to wonder. I have no idea what's wrong with me.

Sorry if this not in the right room