I don't think it is the med to blame actually I think the med is helping you and as the dosage increases the less episodes you will have. I don't have a simple depression, not saying that you do, but I am not the best person to judge against as I take five other prescriptions on top of Zyprexa.
Major Depressive Disorder With Psychotic Features
Post Traumatic Stress Disorder
Borderline Personality Disorder
Generalized Anxiety Disorder