So, this is going to sounds trivial, I think it isn't.
I think too much. I have a hard time relating to people because I tend to understand the world in a mechanical way. My life is rather stressful at the moment and for the last few years. I have a job that essentially requires me to be social so I've learned to fake it quite well but that leaves me drained by the time I get home from work.
I want to say that reading this forum has kept my mind focused for many years and the decline has been more difficult to accept than I would have imagined.