Please be careful with benzos, taking them recreationally will cause you more trouble in the end. You could go through decent withdrawal at the doses you're using, not to mention you can't really get your script filled early.
Blackouts are very common with benzodiazepines; people often take more than prescribed to get high and then wake up in the morning with no recollection of the night before. Seroquel itself is one hell of a drug.. just be careful and use as prescribed.