I have bipolar and was using a low-dose of Seroquel (100-150mg) in addition to my regular meds (at the time, Latuda and Trileptal) for sleep. I realized after a period of time that it was no longer helping and made the decision to stop taking it. My doctor said that was fine. I did experience some rebound insomnia. The first night I was off it, I slept 3 hours. And felt more restored in those 3 hours than in 8 hours with it. I also gained 35 pounds. And I was doing a lot of caffeine to overcome the grogginess.
I now take melatonin and some hydroxyzine (can't do OTC benedryl). Like you, I feel like a new woman. I also take Omegas which can help stabilize mood. I did my thesis in my MS (nutrition) program on mental health diet. So much can be done there. For bipolar, a probiotic will help, as will the B-vitamins. But of course working with your doctor. I'm interested in the WRAP program.