Well DS solved it for me. I started to talk to him yesterday. I was going to use indigo's approach. I said, "When we go for your check up..." He said, "Mom! When the doctor comes in the room, can I leave while you ask him if I am getting a shot or a blood test? I don't want to be there to hear his answer. You can tell me when I come back in the room." Sure, no problem kid.

Thanks all!