Oh my god yes! I had a severe depressive episode two summers ago. Since that time I was totally (well mostly, just normal ups and downs) stable, and then out of no where I had a psychotic break at the end of this january that I'm still getting over. It seemingly came out of no where! It was my first psychosis experience. Until then I didn't even think I could become psychotic. I don't want to be melodramatic, but I feel traumatized from it and like a different person now.
You are not alone.