Burnout is possible in any profession, and med student workload is no secret. It's almost like a hazing initiation, but the students know that underlying this treatment, they are respected. This makes all the difference between nursing and medicine. Those initiating med students really believe in them. My boyfriend is a resident, and he has a ton of support. It sounds like he's being stretched mentally, not broken down.
It's not the physical work that is so wearing on us, it's the spiritual and mental hardships that break us. The retention problems in nursing kind of speaks for itself. It's much deeper than money issues-if it were just money, then physical therapists, pharamacists, etc. would be having the same kinds of issues as nurses. But no, they are heard and respected for their unique skills. And, they don't get demeaned by their very own in their process of learning their skill. Nurses have a horrible reputation for "eating their own".