Health informatics of some sort (nursing, public health, etc.) sounds like it could be a terrific option for you. You could also try health information management if you're looking for something with excellent career prospects that's along somewhat similar lines. I imagine many of your classes would transfer into such a program, depending on where you go (I have to take many of my classes with my university's nursing students - A&P I & II, Human Pathophysiology, medical ethics, etc.), so you might not be as far behind as you could be switching to a straight CS program.
There are many state universities that offer bachelor's programs in HIM. If you're interested and would like a little more information, here's a link to the American Health Information Management Association's website: www.ahima.org
You can also just google health information management and come up with a lot of decent information about the field. For information on accredited programs, check the website of the Commission for Accreditation of Health Informatics and Information Management programs (CAHIIM). Here's a direct link to the commission's search option: http://www.cahiim.org/accredpgms.asp
I understand how you feel. I'm in my early 30s and I'm transitioning to a new career; sometimes I feel as though school will never end! If you truly feel your calling is nursing, stick it out; by the time you're done, prospects may well improve. If not, try to find a career path that makes use of both your interest areas AND utilizes the work you've already put into your nursing program. Best of luck to you!