If you're working retail... how about med ADMIN if you want to switch over to healthcare to work in the same hospital/field?
Alternatively: Go to school for something you might actually want to do with your life?
Regardless, I would say not to do 2 classes per quarter to start. Sure, you can, but why not just 1? Ease into the schedule and work out how much time you need. Get into the groove of things, and then add classes (to 2 or 3) as you get your system worked out. You husband already had 4-5 years under his belt. Jumping in at 2-3 classes per quarter after years off is one of the most surefire ways I know to burn out and quit.
Same token; if you don't know what you'd like to "be" / your major... there are about 50 general ed credits you'll need to do. Keep up on your degree path by getting non-specific requirements taken care of while you think. That way you're still moving forward with 1 or 2 classes per quarter, but you're not locked into a degree as yet.
And YIKES! Woman! Bio and Chem the same quarter? I hope you realize most nursing and premed students STACK their hard sciences with easy classes, or pair a hard science with a soft science. Chem and Underwater Basket Weaving, Anatomy and Physiology and Sex & Sexuality, Microbiology and Psych. Hard science paired with and easy class. Sure, years 3 & 4 is all science, all the time... but you've already learned the language and have the basics down.
The hardest classes in science are the 100 level classes OR the first class in a series (like o-chem 260/261/262, 260 is the hardest). Why? Because you're learning a whole new language. Memorizing, memorizing, memorizing. It's enough to make one want to put their head through drywall, or pluck their eyeballs out with spoons.