I agree - tell the doctor that you have had this in mind, that you have gone to Dr. Callery's lecture and that you would like to be referred to him. My PCP actuallly ONLY refers to Dr. Callery. I'm not sure if that is because of my insurance or because he is the best darn WLS doc in town!
Make a case for yourself - give him a brief description of weight loss history, your current health problems that may be relieved by the surgery, etc. If you haven't had some "Doctor Supervised" diet in the past year, your doc can get you started on one and still refer you to Dr. Callery. The sooner you start that "diet" with the PCP, the sooner you will qualify for surgery (unless you are one of those lucky dogs who don't have to have Dr. supervised diet in order to qualify with your insurance company)!
