What about doing something like GAL, making plans etc but inviting H along with you? Then it's up to him to come or not, can't accuse you of being sneaky, and you still get to have all the fun that you deserve to have. If he comes, then great! Fun for both of you. If he doesn't, that's ok too. You can tell him all about it when you get back. This is an instance where being vague won't help.
Plus, I understand what you mean about getting closer to your goal. HOWEVER, maybe should part of your goal be leading a rich and fun life? Shrinking yourself for the sake of the marriage will never work. For one thing, you'll be unhappy. Plus, you'll never be able to shrink enough for a controller.
I guess that leads me to the next question... how controlling is your H? What do you mean by that?