I seem to recall some similar discussions over the years on FlightWeb. I would visit there, and look. flightweb.com, and go to the forums. Maybe archived.
FWIW (and my opinion is worth exactly what you're paying for it), anyone thinking about EMS or flight medicine really has to take the environment into account. The demands of the job are multiplied by the fact that you're on your own. Well, you and your partner. But that's it.
If I become incapacitated for some reason in the ER, someone else can step in and cover my tasks and I become a patient. If the same occurs while flying a critical patient at 35,000 feet and 15 or 30 minutes from the nearest possible emergency landing, what happens? I've become a patient, the critical patient's care is sorely compromised, and my partner now has to deal with all of it. Oh, and all this in a very tight, small environment; even in a fixed-wing aircraft. Even worse in a helicopter, though at least the flight is likely to be shorter.
So now, I'm also physically in the way. Not a great scenario.
In addition, the constant stressors of flight (vibration, noise, etc.) tax one's physiology more and differently than working in a stable building. Well, maybe our friends in California also contend with vibration, motion, etc.
I can recall discussions about flight jobs for brittle diabetics, patients with seizure disorder, etc. It is a weighty consideration. Even in the best of health, extended flight shifts can be physically taxing. This isn't meant to exclude the possibility; just to emphasize the importance of the discussion.
Take a visit over at FlightWeb and see what you come up with. See ya there!