Overdosing on olanzapine is a horrible experience?!

A few weeks ago I took a accidentle overdose on olanzapine and the side effects were awful. I think it has perminently damaged my mental heath. The side effects dont kick in strait away it started with chronic headaches followed by vomiting combined with feeling faint a few days later I become paranoid as if I was on something (potentially worse than a proper drug) I couldn't make out if I was hallucinating or not it was a very scary time. So if your low dont take anti phsycotics to od its worse than weed since the accidental od I still live in fear of hallucinating I get depressing and bad nightmares which I put down to this medication. This isnt a question as such but highlighting the dangers of oding on anti phsycotics.