I take seroquel 400 mg every night for sleep, and 50 mg every 4 hours as needed for anxiety. A couple times I have accidentally taken my 400 mg a couple hours later, and I got really nauseas and shaky. Is this normal? Is it a withdrawal symptom. It's just so weird because I usually take it at 8 pm, and I took it at around 11 pm. Can withdrawal symptoms happen that fast? I thought that Seroquel is non-habit forming....