I would like to add to this point. Cognitively I have had times when I was reasonably high functioning (though not close to what I should be), though for the last year and a half I have been in decline. Yet in the late 90s I was full mental zombie, and this has happened at other times briefly. This disease changes, so long time patients often understand most of what people are going through even if they are not there themselves at this point in time. The same goes for all the other symptoms.