I don't know about an addict taking Valerian root. That's where Valium got its name, so I heard, and we were advised in treatment to avoid it. Chamomile by itself should be fine, though.
Dani,
Seroquel is an anti-psychotic, but it is used for MANY psychiatric problems besides psychotic symptoms. Examples are bipolar disorder, depression, and sleep. Does that help your confusion any?
Love and hugs,
Eddie