How long have you been on these meds. It could be that you have yet to adjust to them. But yes, some meds work differently from people to people. Give your psychiatrist's office a call. They should be able to fit you in for just such an emergency. If that doesn't work, visit the emergency room. They can stabilize your meds for you as well.

For example: I have aquaintances who get zonked out on as little as 25mg of Seroquel yet I tolerate 300mg quite well.