Have you tried lithium orotate? You can get it over the counter in health food stores or online. It is getting really good reviews by people who've tried it.
If you google for it, you can get more information on it.
Also, have you had your thyroid tested? There are some studies online linking the correlation between thyroid dysfunction and schizophrenia and bi-polar. This is a good site to learn more about the many, many symptoms of hypothyroidism: