There's nothing wrong with cutting your seroquel in half. I always start on 25mg when I go back on seroquel, and it's enough to knock me out in the beginning. I'm sorry you had such a bad experience with risperdal. I haven't tried it but I've been on a few antipsychotics and they all felt completely different to me as far as side effects and efficacy. I'd be surprised if seroquel gives you panic attacks, it's very sedating.