Guys aren't bothered by the same things that bother us. Remember, they're from Mars! (And, in this situation, that's a good thing!)
If you like him and want to keep dating him, you should tell him your story about
how sick you were, and how surgery made you well. He obviously cares about
you, and he'll be glad to know that you're not sick anymore. I've told lots of people my story, and everyone has been really supportive.
Good luck, and let us know how it goes.