Seroquel is an atypical antipsychotic that is used to treat schizophrenia, Alzheimer's disease and even bipolar disorder. I have seen some patients who take anxiety meds that also take Seroquel, but they are few and far between.
Anxiety and panic attacks can both lead to a psychotic break if not treated properly.
Interestingly, schizophrenia is very similar to pellagra in many ways (niacin deficiency) and there is new, but little, evidence to support that taking niacin actually alleviates or dramatically lessens the symptoms of schizophrenia, when taken with medication. Niacin can also alleviate symptoms of depression and anxiety. Taking a b-complex vitamin daily couldn't hurt. Best wishes.