Sounds like a big mistake to move along at this time. Suffering from anxiety myself, I know what you must be going through. All of your 8 points are anxiety and fear, and it doesn't seem like you really want to move. I mean, you want to try different skills, but losing the flexibility is a HUGE thing. Since change is hard for you and there are a lot of other things you're concerned with, it seems like it's not a good move to change jobs now. Having a great boss is worth it's weight in gold! Since you said you already accepted it, you'll probably need to just move and hope it works out well. I sure hope it does for you!
BTW, sounds like your husband steps in a lot of take your kids to school and you're the one feeling bad/guilty about him doing it. Try thanking him for his contributions to your family and career, he probably doesn't feel appreciated for his 25 mins a day (each way or roundtrip?) investment in you. Just a bit of advice from someone who has been married for 14 years.
Good luck on your new job if that's the path you chose.