To my knowledge, neither klonopin nor seroquel would be first line treatments for insomnia. Seroquel is certainly sedating, but that's a side effect, not its purpose. It can also cause pretty severe weight gain and diabetes, so to take it just for insomnia seems like overkill. As for your withdrawal, are you in withdrawal? You don't state what your symptoms are. Not everyone gets bad withdrawals, in fact most don't.