Not knowing the extent of your condition, it's hard to say, but, let me toss out somethings I have said to my son.
If you cruise on Carnival, you will have a larger room, than most ships.. that will help,and if you can book a larger cabin, mini suites on up, that would be more open for you. You could also use the door wedge to keep the door open, for short spurts at a time, during the day. Aslo booking an aft corner or regular balcony will give you plenty of extra room.
All public spaces are open, and, many areas are open for several soaring decks. With so many people, this is important, so there is no sense of crowding
Many RCI ships [Radiance Class] have decks with lots of glass, which are wonderful. The pool deck is enjoyable,and spacious, to just stand at the rails and enjoy the views.
If you ever felt a sense of things closing in, there are numerous places onboard that will shake that off..I hope I helped a bit.