Dreamer, I don't have a brain injury, but I do have "fibrofog" (ditzyness caused by fibromyalgia). I had to change my attitude. When I lose something I need, I assume its because there's something I'm missing that I didn't realize. When I have an "interruption", like your pin explosion, I figure I was just getting ready to make a really big mistake and need to do something else for a bit.
It's sort of an "Angels Watching Over Me" point of view. They say its not what happens to you, but how you handle it that is important. Remember, we're not as smart as we thought we were when we were early 20's!: ) Take care.