yes it happens it happened to me with speed and lasted weeks i thought serious shit was happening all religious stuff and that.I thought my ex was god for real.Ithought all indians were like the devil and when i was taken to hospital i was put in intensive care i was nearly dead at this stage 8 days not 1 wink of sleep.I was seeing grey clouds around some of the people and i was sure they were dying so i told them man i was a froot loop will never take that again ever ever fucked me bad i was on antipsychotics for a whole year and they suck.