 This is a two phase, 18-week research study in which participants who remain symptomatic at the end of one phase 10 weeks enter into the next phase. In phase I, all participants receive paroxetine CR Paxil CR for 10 weeks. Participants who continue to have anxiety symptoms will enter the 8-week Phase II, in which they continue taking Paxil CR and they will also be randomly assigned by chance, like a flip of a coin to receive quetiapine Seroquel or placebo contains no active medication. 