You have time in the CRJ and you STILL have to ask this question!!?? (just pulling your leg). In all seriousness though, If I were in your position I would probably stick with nursing. I'm going to assume from what you wrote that you don't currently have any form of college degree...yet you still have obviously flown for a regional airline. So, if you've done it once before without a degree you can certainly do it again if you were to have your associates.
You say that you don't want to limit yourself to the medical field; but, on the flip side of the coin if you had a BS in aviation (*insert catchy degree name here*) you're limiting yourself to aviation. At least with a nursing degree you'd have two directions in which to go whenever it is the economy and this industry turns around.
From the HR standpoint at an interview I don't believe that a nursing degree would hurt you one bit. They are interested in a college degree to mainly show your focus, determination and self discipline (at least that's from what I understand. I could just be running my mouth). A nursing program in not a walk in the park and takes a lot of work. I have several friends who are either current RN's or in school to be one. I can tell you that they got their "you know whats" handed to them on a plate. So, that being said I don't think that it would be looked down upon in the least.
Anyway, best of luck with whichever way you choose. I love flying more than anything. I don't consider being a pilot something that I do. It's who I am...and has been since I could barely walk. I couldn't ever imagine not having aviation in my life; but, being where I'm at in life and seeing what I've seen in this industry, I now really wish that I had a degree in something other than aviation. Everyone, regardless of profession, needs a fall back plan. If you're at a crossroads in life in which you can get one I say take it!