MM, I know you are terrified of Lithium because you think you might gain weight, but I just want to tell you what I was size 6 on a high dose of Lithium which for me was the ideal size - I did not need to be size 0, I do not have that kind of body build, size 6 was good enough, so Lithium does not have to lead to weight gain. Lithium is not like Zyprexa.
So maybe try it for a short while and see where it takes you? What size are you now? 0? 2?