My daughter is on Seroquel and they do say that you should drink lots of water when on it so that it doesn't stay too long in the kidneys causing damage. Are you drinking enough fluids??
I would suggest you keep and intake of fluids and output of your urine for a week or so and see if there is a big difference.
I hope that you find out the source of your problem.
Good luck and keep us posted with how things are going with you.
~ Goody