To do with autism

My brain is always very active, and periodically gets overloaded with thoughts. In the not-too-distant past this would cause me to have fits, but the tablets seem to have stopped that. What tends to happen nowadays is that I get so wrapped up in my thoughts that I become unaware of my surroundings. I do things like walking into the road without looking. I had a variation on that theme two days ago when I did the same thing but without noticing the kerb. I landed on all fours, and have two black palms, one swollen knee and one cut knee to tell the tale. Since then at the historic building, I have knocked my head three times, and fallen on my elbows while going up the stairs. I really must be careful, but all this moving lark is starting to wear me out.