The last time I went to school (for a Tech degree, already had a bachelor's by that time) I ran into an acquaintance at the book store. She was a retired college professor and was very excited for me to be going back. She warned me that it would take one semester to get back in the habit of studying and that every student she met spent that first term procrastinating. From community college to the master's level. She was right.

I know of a woman who was in an accelerated MBA program at the Wharton School of Business. She went to the ER one night with panic symptoms and found all of her classmates also in the ER for panic. All of them. So you are not alone.

An element of school is just stressful no matter who you are.

I don't know about the rest.