Super congratulations! You kicked butt with the weight loss. It is wonderful how many steps you took to improve your health, physical and psychological.

At my very heaviest ever, on not so friendly bipolar medications, I, too, sought help from a dietitian. I specifically asked for that professional help because my triglycerides and cholesterol were through the roof, and I had become pre-diabetic. I was also put on a somewhat low carb diet of 60 g net (not total) carbohydrates and a reasonable fat allowance, but not one that allowed lard sandwiches. I lost 40 lbs in six months on that diet and normalized all of my blood work. I retained the loss for a few years, and in the past 8 years since I have never reached that highest weight. I have gained, because of medication changes, but I am taking charge now, too. My current diet is just on my own, but I bring to it the knowledge I gained from my time with the dietitian. I allow myself some more carbs, but am still keeping them in check.

Lithium was weight neutral for me, too. I take Seroquel XR and though at higher doses it's a challenge, at doses of 500 mg and below I can lose weight on a diet. At my current dose of 500 mg, my appetite is reasonable enough that dieting isn't that big of a struggle. Being stable (or mostly) is important for me, too.

Unlike you, I have not added a significant exercise program into my life. My energy levels have increased, though. I would not call myself completely sedentary anymore. It feels good!