First of all - remove this word from your vocabulary RIGHT NOW
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but hey... she's a nurse and I was just an EMT.
Seriously, I assume there's a difference in level, but why would what you do be a bad thing? You clearly help people for a living - as does she. Why would that not be an attractive quality? Maybe you're not a qualified doctor, but you do what you can with what you have (whether financially or intelectually; it doesn't matter)
Also, it sounds like you will meet her again, you just don't know when. But having that fear is a good thing, because next time you see her you can use that as a reason to approach her. Tell her that you're beat and have x hours left until you can take a break. Find out when she can and tell her to meet you at y and you'll go for coffee. Keep it almost this brief.
Don't worry about routines ect, it's not a cold approach - use the canned stuff if you guys run out of conversation after you meet up.