Relate closely to your tale. I, too, have an invisibile illness (years of depression and anxiety, then thyroid disease) and I became a teacher in mid-life. I taught high school English and it exhausted me. I watched it tire out "normal" people but for me I spent Sundays recuperating and although I loved much about the job it just didn't work--I lacked the resilience necessary to make it from one week to the next. No matter how efficient I was, it was a never-ending energy suck. Before teaching I was a Disability Examiner for five years, so I am well aware that people who shouldn't/can't work are denied every day. Thanks so much for this article!