Check out if you need paperwork for your meds. I cross through several countries when I travel, and they might have different rules. I don't know how much this applies to a cruise, but make sure never the less. Sometimes you come across some powerfreak who decides to make your life difficult over a formality, so be prepared. Also make sure that you can get your meds in the ports you guys will be arriving in. Just in case.
I travel with a note from my doctor about why I need the meds.
You might also want to let the medics on the ship know about your illness and your meds etc.

You have gotten some good advice about adjusting the meds to local times, so I'll not go into that.

You might get hypo. I always do when I travel. Try to pace yourself. Don't plan too much in a day.
Happy for you and your husband! What a treat!