Hi Kristen,
If you pace yourself, then it is feasible, at least for me it has been.
I work fulltime and I'm a business owner (which has its own pros and cons).
If your legs are not affected and your energy is ok then why not finish your nursing degree? And not all nursing jobs have you constantly on your feet, do they? You would get a chance to sit part of the time? And you're in a temperature controlled environment? And you get to wear comfy shoes?
I go to online school (which also has some pros and cons!) The work is very demanding, and I have to deal with back pain which is worse the more I sit! And, I need to rest a lot, or the fatigue will do me in.
My school has quarter classes that go for six weeks, but highly accelerated. I just started TWO of them...

(Hope I'm not being foolish!)
I currently have a 4.0 GPA, but you don't NEED a 4.0 to get the degree. All you need is the degree. All I want is to absorb the material, get "good enough" grades and get the degree at this point.
In my human resources class, they even noted that a 4.0 might even
hurt you when job hunting, believe it or not.
I'm 49 years old, and I'm not letting MS stop me from getting my degree.
Keep in mind that there are lots of effective treatments on the horizon that will hopefully keep us going for a long time in spite of MS.
Good luck and I hope you get your nursing degree!