Sudden onset psychosis lasting months

Pt is a 20-something male. A few months ago, "something happened" at work that he can't expound upon. Within one day, he slumped into depression with minimal talking. He became paranoid, responds to internal stimuli, made references to "thought insertion" regarding aliens and demonstrates disorganized speech and behavior. MRI, syphillus and A/I workup wnl. This has been going on for months. What could this be? Can schizophrenia come on this suddenly?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Psychiatry Source Type: forums