I would hope that your DF will be doing all he can to help also!! If he will get unemployment that may help! Unfortunately, at this time the housing market in many areas is not good and it may be a bad time to try and sell your house.
I would consider leasing your house (say for a year) and that way you will still have your house when you are in a better shape to afford it. You can charge a substantial security deposit and an upfront 1st month/last month rental/lease fee. If the person you lease to can not afford it all at once, you can let them make the deposits in a three month payment plan. This will also help you continue to build equity and hopefully in a year the housing market will have recovered from this point.
As for nursing, in myy area there is a demand for nurses! I have been in nursing for more years than I care to admit and there are always swings in the demand for nurses, with a steady need for at least some nurses on a regular basis. I graduated when managed care was the new big change to healthcare. It was supposed to revolutionize patient care, um, yea right. Didn't last too long!
There are many nursing jobs that are outside "the box". I worked as a new grad at a rural community hospital, for a year, than transferred to a much larger hospital. There is also long term care, dialysis (always a greater demand for, than staff to fill), etc. etc. etc...
That is one of the beauties of nursing! As for boards, get as many of the books that list test questions and answers on the boards and read, study them until you can understand and answer them. Best way to study imho!
Good luck and I hope things work out well for you!! Keep us posted!