I was on Lithium for a while and had to go off it due to kidney damage. They thought it might be diabetes insipidus because my kidneys quit concentrating my urine, and I kept getting lithium toxic because my kidneys weren't filtering the lithium.

I did 3 24-hour urine tests and every one of them came back with abnormal volume (like 8L in 24 hours) but the lab always said everything was fine. They referred me to a nephrologist, and took me off the lithium. My most recent test came back with some abnormalities but the nephrologist said it was fine. Once I was off the lithium I was lucky, my kidneys seemed to bounce back. My urination looks normal again.

Diabetes insipidus is mostly controlled through diet and fluid intake, correct? It's not an insulin based diabetes so you don't have to take insulin or check your blood sugar.

When I had to go off the lithium, my pdoc put me on Abilify. It works better than anything ever has. I hope you find something that helps.