MrsDodge, do you have to go to the doctor who has known you forever and who you're afraid might complicate things with his reaction?

If you're going to see this family doctor anyway, I'd start in "reverse" and tell him you wish to discuss mental health problems and are concerned about his possible reaction to you and ask if maybe he would like to refer you to a psychiatrist to talk with about it instead of himself. That should tell him how serious you are and if he replies, "No, I can help you" then you can continue but if he poo-poos you in any way, I wouldn't proceed, would point out that reaction is the sort you're afraid of and insist he recommend a specialist (psychiatrist) for you to go see and talk with.