I find it amazing that stress could cause a psychotic episode. Maybe stress triggered a pre existing thing that didn't show up yet or something. Whatever your diagnosis is now maybe hadn't manifested until then.

Work place environments can be the worse gossip mills. And your duty managers sole purpose may have been to always make her self look as good as possible to upper and advance if she could at others expense.

Everyone looking at you differently it seems would only be if you changed in some way other than the people at work who may have all been back stabbing you. Was it your perception of things changed maybe. I dunno.