PTSD can definitely cause psychotic symptoms. It can appear similar to schizophrenia but without the cognitive impairment and disorganized thinking/speech. Has complex PTSD been explained to you? Some clinicians consider cPTSD to be BPD. In these individuals psychotic symptoms emerge during periods of stress and is connected to feelings of abandonment. It is a part of the splitting defense. These psychotic reactions develop abruptly and are brief. Their delusions can easily be corrected when someone points out the irrational thoughts which makes them very different from a schizophrenic delusion. These are firmly held beliefs that usually develop gradually and cannot be changed with suggestion and contradictory evidence.

Usually when a person becomes psychotic they question what is happening to them until they reach full psychotic insight. The prodromal period is confusing, because the person is struggling to determine what is real or not. Some people can stay in this period of years and may not even develop psychosis.

It is very possible to have hallucinations without delusions.

Have you had your iron and B12 levels checked?