After your health and the priority needs of your family, PLEASE put school first for a while.
Nursing school, especially first semester is more than a full time job.
I don't know how those students who work near full time and have no help at home survive. They certainly show their stress, and their progress shows it.
The good news is, that there is lots of support and guidance available at most colleges. They can help you with tutoring, finding financial aid, helping cope with childcare arrangements, ...the works!
Also good news is that nursing school is a very small time of your nursing career. You won't always be studying instead of going out with your buds, and you won't always be so poor you eat ramen noodles 6 days a week. It will be worth it all in a just a few more semesters!
Now is the time to ask for and gratefully accept any help you can get from family, friends, classmates.
Don't forget to enjoy what you are learning. Nursing knowledge really is great. I'ts empowering!