Good for YOU! I'm so proud of you! Heck, if you weren't nervous, then you would be abnormal! Change can be good, but it's still change, and change is stressful in of itself.
I would highly, highly suggest that you and your WH sit down for a real heart-to-heart talk about running the household. I have something a little radical for you two to consider. You are now working 30 hours a week. I'm going to make the assumption that your WH works 40 hours a week. 40-30 10 hours a week. You "owe" the household 10 hours a week doing stuff that keeps the house running grocery shopping, cleaning, mowing the lawn, running the kids to the doctors, whatever. Then you two are "even."
All of the rest of the stuff that it takes to run a household should, IMO, be split by the two of you. That means that WH may have to do some cleaning. May have to run the kids to soccer and music practice. May have to stop by the dry cleaners, then do a pickup at the grocery store, then come home and wash a load of laundry. Or, it may mean that you hire out some of those chores, or task your children with chores that they are responsible for.
You can't do it all. You shouldn't even try to do it all. Put your foot down on this early and often, get that list of chores split up, and insist that each person does their share. Yeah, it may mean that the dusting isn't as good as you want, and the folded laundry isn't as precise as you would do it. You have to farm out or hire out some of the chores/errands/etc., that you were doing because now, you are working outside of the house and bringing home money as a contribution to your household. That deserves respect and it deserves you having your "off" time as well. (((hugs)))