How did I get this way?

I'm 57 years old and feel my competence dripping away. I have trouble paying attention at neetings, remebering things people tell me, even losing track of the meanings of things. I think I can deal with incompetence, or acceot it at least ... but I have a devil of a time understanding why this is happening, because there are so many possible candidates:

* brain tumor
* stroke vent
* very high blood poressure
* diabetes
* 57 year old forgetfulness
* anxiety over forgetting
* ADD
* discouragement/lack of confidence from past mistakes

Does it matter which it is? Maybe not. But I feel so self-centered all the time, covering up from my disabilities

And I wish I had a great excuse that would make people bend over to let me stay on.