If you're not experiencing symptoms and aren't looking for meds as an answer, then a psychiatrist and/or diagnosis isn't going to be of much use to you. If you just need to talk it over and have someone to give you a reality check now and again (not your family), then it would probably benefit you to get acquainted with a therapist. Good therapists can spot mood episodes a mile away, and know how to ask the right background questions. They can also assist by recommending if/when you need to see a psychiatrist. If you see them regularly, at least for a while, they can get to know you and your personality. IMHO this would be your best route.

You already know that if you head straight to a psychiatrist you're likely to come away with a diagnosis and a prescription.