So--here's an update:
I interviewed for a Nursing Assistant position at another hospital, and left my educational background on my resume, because I really feel it is a part of my qualifications. I was interviewed by two women, one from human resources, and one who was the nurse learning specialist for the hospital. The first thing the HR woman said was "Wow--I've never met someone with such an excellent education" and I was thinking uh oh... So I just chuckled, said "I hope that's a good thing..." then went on to say something like "well, it's an entirely different field, but I do think it has helped me to know what to expect in terms of the rigors of nursing school..." That was all that we said, and the interview moved on from there. They were really most interested in trying to get a feel for how I solved problems, and how I communicated in difficult/sensitive situations...the interview felt good, and I was offered the job four days later!

I've also since found out that the place where I didn't get hired (even though I was told I was an excellent candidate) actually filled all of its positions with folks who already worked for the hospital, or who had a relative who worked there.
I'm just glad that the hospital that hired me is willing to give me an opportunity! I'm so excited to start!
Again, thanks to everyone for the advice and opinions.