My brain seems like it isn't working right

Today I spent some time with my boyfriend after I had worked a four-hour shift as a cashier at my retail job. It was really busy because it is getting close to the holidays. Several times I noticed that while I was talking to him, my sentences just didn't make any sense to me. I used the wrong word and after I realized it, I used the correct word. Then I actually used a made-up word. We both started laughing because it was really funny! I told him that it seemed like the wires were crossed in my brain.