Actually I think it is a very good sign that so much time passed before you relapsed. I think that suggests you might be able to get well at some point.
I mean you quit drugs in september and relapsed in february. All traces of the olanzapine must have left you body within a month I’d say is probable. So you were actually functioning a long while with no help from meds.
When I have quit olanzapine in the past I always relapsed within 1 1/2 month. You are way past that.
I think you could maybe make it without drugs, but you need to keep stress at a minimum since that triggers you. Maybe get a job with little responsibility where there always are people who can step in if you get sick or whatever and generally try to keep your life level and do stuff that makes you relax while avoiding stressors the best you can.
Get some valium or other sedative that you can use occassionally when stress peaks.
If I were in your shoes I’d try to get off the ap’s again when you are stable. If it took many months before you relapsed that proves you were functioning without ap’s.