You sound like me two years ago...except that I had been a science major and was doing science education work (behind a desk, not in front of students). Sitting at the computer for hours at a time was *killing* me! I wanted to move around, see people, and have some variety in my day.
Now, I'm not a nurse yet (looks like I'll be starting school January 8th, though...yippee!), but I'm very confident that nursing is going to be a great fit for me. However, it took me a little while before I came to that decision. If you aren't in a desperate hurry to change careers, I'd strongly recommend picking up a volunteer gig at a local hospital. (It was actually a volunteer stint in the ER at the local children's hospital that turned me on to nursing...it made me appreciate what the profession was all about.) Anyhow, I learned a lot about nursing from watching them in action, and overhearing bits and pieces of their conversations. What I learned at the hospital I worked at was that there was a lot of frustration and dissatisfaction there, but that there were still plenty of others who took a lot of pride in what they did and wouldn't trade it for anything else.
Now, all of that being said, I'm going to school with the aim of becoming a nurse practitioner...and a some of that is because I knew I wouldn't be happy with hospital working conditions (mostly because I like structured hours, but a little bit because of lack of respect, etc. etc.) So take my encouragement with a grain of salt.
Best of luck in the future!