I’ve thought about and dwelled on my bipolar condition for 35 years now. What has helped me so far is understanding exactly what I go through helped me get an accurate diagnosis and treatment. I journaled first 2 years and not only saw a pattern of highs and lows that matched the season but also the length and severity. That helped me be diagnosed Bipolar 1 with a seasonal pattern. The dwelling and constantly thinking about it though just causes me extreme stress and anxiety. It wasn’t til recently that I focused on my health in a way that I focused on things I can do to relieve stress, fatigue and using a light box etc . So I guess what I’m saying is talking about it can help you process and learn more about your specific type and give information to your therapist that may be helpful in treating you. The constant thinking and dwelling though caused me extreme stress and anxiety.so I’d say some is helpful but to much can be harmful. Hope this makes sense and good luck to you.