Thanks for the tip Kathy.
evad I agree it can be awsome. I remember snorkeling and free diving to the sunken airplane at La Ceiba 30 years ago! There was a little beach bar there and beers were a buck.
But don't give up yet! Definitely check out Reef Divers on Cayman Brac and Little Cayman - the diving is great and the valet services are wonderful. And it is a good idea to work on building up strength, not just for diving but for general quality of life!