You can't succeed until you realize that you and your family are going to be fine. I am a fourth year medical student and mom of 2 boys. Medical school is difficult, but the first two years of primarily lecture is very doable, even with a family. Just think what they were doing last year, partying as a senior in college. They will all be coming to you for advice on how to manage time.
Financial concerns are always difficult and personal.
Many, many students and their families live off student loans for their entire medical school careers. I know many male medical students who have children and whose wives do not work or work only part-time. Even if your husband does not find work right away, which I'm sure he will, it could be a wonderful opportunity to be Mr. MOM and strengthen his relationship with his kids. This may mean tightening the belt financially - but you'll be in good company. Nobody in med school has money to burn.