I'm shocked with all your credentials you still can't get a full-time job! Age discrimination may be a factor, I would dye your hair to look younger. Where I work, we have a lot of older nurses, most dye their hair. In fact only one has gone grey! Sometimes if I wait to long to dye my hair, I'll get a comment from a coworker pointing out my roots are showing, like I don't know and can't see them in a mirror! I like to color my hair personally, but it is expensive so I try to minimize how often I do it. While age discrimination exists even in nursing and you can see some hospitals that have almost all young fresh faces, there are places that hire older nurses. Check out AARP magazine/online because they rate older friendly businesses. Look at the places you are applying, stroll in and check out the staff, if you can find one with older nurses and not all young focus your efforts there.
Also expand your job search
to nursing homes, long term care, and research the managers. If you know there names many times you can google them or check them on linked in or pipl.com and learn a little more about them professionally and then you can contect them directly and request a job.
What about all the places you have been volunteering or working short gigs at can you get help from anyone there re a job. Perhaps a doctor at the clinic has his own practice or can at least give you a reference for a job! What about agency if you can get a foot in a place thru agency, and people get to know you, that can be an in for a job!
I'm really shocked that so many nurses are have trouble getting jobs, but I guess this is not really surprising thinking how many college grads can't get decent jobs, even with business degrees and how many law grads can't get jobs. So many schools offer nursing programs
and more and more nursing schools are opening up I guess that's causing a glut of nurses. You may have to be open to relocating if that's possible!
What are you doing now for money and health insurance? Did you have a job you quit before nursing? Is there any way to go back to that?
Honestly, I'm older and still have 20 years to go and I wonder how I will make it. Eventually I would even consider a non-nursing job for better working conditions if it paid a living wage, but how many jobs like that exist in America today! I'm trying to get my mortgage paid off before I retire and sooner would be better, because then I wouldn't have the same money pressure as I do now.