sub17 - in the situation you describe above: moving, kids, money, saying goodbye to friends & family... this is a stressful time for you both. doesn't he have as much responsibility to be sensitive to your situation during this time? whether D/s or vanilla, any loving relationship is about being there for the other person - not just sexually - but emotionally.
i hate that you're asking yourself if you're a bad sub. does this mean you're a bad person? NO. just because your relationship is D/s - does it mean it's only about sex? NO. he's not only your Dom, he's your fiancee and partner in life...
when i get super stressed, i tend to pretend to be wonder woman and hold everything in until finally i blow up. now, i try to talk things through, keep an open mind, ask for help... it's great that you're asking questions; hopefully, you're finding some of the answers to help you through this. good luck with all the changes in your life!!