I have always had school sickness, as others have seasickness. I cried when it was time to go back to school long after I was old enough to be ashamed of such behavior.
Still today, I cannot cross the threshold of a teaching institution without physical symptoms, in my chest and my stomach, of discomfort or anxiety. And yet I have never left school.
The boarding-school experience in Paris was very hard, I didn't put up with it very well. I was sick all the time, or in any case frail, on the edge of a nervous breakdown.