Huh, I think I've always been autistic and ADHD, but this reminds me of how I conked my head pretty good a couple of times when in middle school. I fell forward going up the steps and had to get 8 stitches to close the gash on my forehead. Another time I conked the back of my head when falling backwards off a couch.
But back then in the early 80s, none of the doctors thought I should get x-rays.