I second low carb, ketogenic + coconut oil. Plus make sure you have eliminated every speck of gluten. I was reading about the gluten/schizophrenia connection this morning, and if I were trying to eliminate schizophrenia, I wouldn't get anywhere near the stuff. Not even in small amounts. Not even a slip.
Are you vitamin D sufficient? Schizophrenia is associated with vitamin D insufficiency during development. Now, you may think, "it's too late", but vitamin D sufficiency is good for everyone, and besides, we can't say that correcting a sufficiency later in life couldn't reverse or at least attenuate the illness.
People often report a big improvement in their mood and mental function when they correct their vitamin D levels, so it's worth trying.
Here are some references, if you would like to investigate further yourself:
Kesby JP, Eyles DW, Burne THJ, McGrath JJ. The effects of vitamin D on brain development and adult brain function. Mol Cell Endocrinol. 2011. Available at: http://www.ncbi.nlm.nih.gov/pubmed/21664231. Accessed August 6, 2011.
Eyles DW, Feron F, Cui X, et al. Developmental vitamin D deficiency causes abnormal brain development. Psychoneuroendocrinology. 2009;34 Suppl 1:S247–257.
McGrath JJ, Burne TH, Féron F, Mackay-Sim A, Eyles DW. Developmental vitamin D deficiency and risk of schizophrenia: a 10-year update. Schizophr Bull. 2010;36(6):1073–1078.
Kinney DK, Teixeira P, Hsu D, et al. Relation of schizophrenia prevalence to latitude, climate, fish consumption, infant mortality, and skin color: a role for prenatal vitamin d deficiency and infections? Schizophr Bull. 2009;35(3):582–595.