Chill. OUT. Seriously, take a deep breath. You are an adult, you were a professional. I don't know what your desk job entailed, but like me, it sounds like it was no where near a medical facilty or people in need. Firstly, remember that. You did your job, I would assume well. You dropped out of art school, and did something non-artistic (?) so you know how to adjust to a changing life plan, how to adjust to a different work style and way of thinking.
Second, organize yourself the way you are most comfortable. If you feel handouts should all be together, do so. If you feel lab handouts should be with lab work, then do that. Third, you deserve to be there just like the rest of the alphabet soups. You did the work to get you there. They might have those degrees, but I would hope your nursing program
doesn't give auto-entry just for that.
Finally, don't worry about the other people. I know, I know, easier said than done, especially when you already feel inferior for not being able to do a BP in your sleep. But there will come a time when your work/life experience will help you, just as their experience is helping them now. And if what you say is true, no hubs, no kids, no rent to pay, then you are probably way ahead of many, and they are jealous of you. I am.