I Was Cleaning Something Underneath A Shelf And I Hit

I was cleaning something underneath a shelf and I hit my head. Earlier today around noon pst. I'm not feeling to different just nervous. I carried on my day cleaning out pool mopping the floors and changing out a car battery. Now as I'm getting sleepy I'm worried about hitting my head. I walked in a straight line for about 10 feet like a field sobriety test and didn't fall from lack of balance. I'm just a little worried. Should I be?