Okay worst now that I have been thinking about it was when I was on Effexor before I was diagnosed with Bipolar Mood Disorder. I developed an extreme fear of the dark. I'm pretty sure I was experiencing psychosis because I was terrified to sleep at night. Had extremely realistic nightmares. Weirdest/Most Unexpected was when I lactated and there was no warning the drug could do that. I have noticed I get the rare side effects so I check those before I agree to be on any medication.