Yup, drives me nuts. I try to keep these things on a schedule (dentist in January and July, physicals in August, therapist on Thursdays, etc.) because then it becomes routine and I'm not quite such a mess constantly checking my card organizer. Let the schedule change, though (kid needs to go back for a filling in February, therapist is full up on Thursday, schedule two weeks in advance on a different day), and things get messed up and I'm a nervous wreck.
People talk and talk and talk about social skills and "acting normal" like they're the most important things. Executive dysfunction can make navigating life a lot more taxing than it needs to be.
I'm STILL thinking nasty thoughts about the soccer coach who decided, back in August, to have a floating schedule for practices all fall.
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"Alas, our dried voices when we whisper together are quiet and meaningless, as wind in dry grass, or rats' feet over broken glass in our dry cellar." --TS Eliot, "The Hollow Men"