I took Zyprexa as well a few years ago. Bad idea! I had a similar experience. Within the first month after discontinuing the drug I lost 12 pounds without even trying. Unfortunately by the time I realized what was causing the weight gain, I had gained around 40 pounds.

I switched to Seroquel which I am taking now, 200mg daily. I have not experienced any weight gain with this drug. I am not taking it for schizophrenia but it is approved for this purpose.