RE: #2.
Could #2 be a set up for fraud charges for not answering truthfully if the doctor asks?
Does the doctor have to report the patients answer to a database?
Don't lie - turn the conversation to him. “How do you feel about asking that question, does that bother you?” Now, he has to speak to that instead of staying on whether you have a gun. If he goes back to again ask you if you have guns, say something like, “That doesn't apply to my medical condition and I think the government shouldn't ask that of anyone. Do you agree?” After he answers that, say something like, “Let's get back to why I came here today - what are we going to do about my bad knee (whatever made you go to the doctor). Practice asking him questions instead of lying about your guns.
Or you could use the direct approach: Do you have any guns? You say, “I can't tell you or I'd have to kill you.” What about my enlarged prostate? (Whatever made you go to doctor). The doc would suspect you have guns, but he wouldn't know for sure.