My sister in law I think is having a mental breakdown. She goes into these fits saying she's someone else, talking about herself as a second person, kinda like being possessed. Saying we're killing her by not understanding. She got picked up by the cops and got sent to Oklahoma City to the mental hospital for a week. They didn't give her any meds just a shot once a month. Since she's been out she has these episodes every other day and I don't know how to talk to her when she started to have one.
Check this link out for some insight into your question:
https://www.brightquest.com/blog/a-psychotic-break-vs-a-mental-breakdown-comparing-symptoms-and-treatment-options/
or
https://www.nami.org/Blogs/NAMI-Blog/March-2017/Understanding-Psychotic-Breaks