The general rule of thumb is that hypo or mania last two weeks and not be caused by a physical illness or drugs. It’s not unusual that bipolar goes undiagnosed as most people in hypo or mania don’t see their doctor during an episode. They seek help for the depression. It is possible that the reason AD haven’t been successful is because bipolar need a mood stabilizer or AP. I can’t recall the site that gives a very good analyst of bipolar spectrum, but it is a spectrum. Maybe someone will chime in and remember the site.