I truly believe you, I have been suicidal since 1997 and I am also bipolar II. And when I was on lithium is was very clear headed and happy till I got sick. Even though diabetes runs in your genetic line Insipidus is only caused by lithium. According to the research I did this summer CDC, FDA, John Hopkins archival department and Scientific published literature, there are over 40 type of type 2 diabetes. When you get a GENERAL blood test it only looks for the most common one that millions have from genetics and or bad life habits.
Each type of Mood stabilizer medication like; lithium, quetiapine, chlorpromazine, olanzapine, risperdal. divalproex, Lamotrigine, valproic acid, and the list goes on, all can create their own specific diabetes through a unique DNA genetic pathway each having there own signature. Yes you were more prone to diabetes in general, but not insipidus that is only caused by lithium. Back in the day there wasn't the medication options we have today even Lamotrigine wasn't invented and released to the public till 1994.
I am making an in depth post on this subject most people don't know and tend to just trust our doctors to make us better, or monitor or side effects and they typically don't.
I am actually prosecuting my psychiatrist for criminal assault and battery. Lithium is a class (B) controlled medication that require blood monitoring and side effect intervention. By not doing the intervention monitoring he is criminally liable. Plus he never asked for my consent to put me on lithium he just did it cause he is old school and that's the way they use to do this. He is very old he graduated in 1963 and is not always or does not appear to have a great memory. I am not after money all I want is his practice closed and his license pulled forever. I can not in good faith allow him to hurt others with his negligence .
Buddy Mack.