Have you started using your accutane yet ? It can make you feel pretty ill for the first few weeks (dizzy, sweats, sickness, fever, feeling tired etc) and it is also worth mentioning that your acne may flare up when you first start using it and you may also experience really dry skin, itching and the list goes on.
If you can I would advise doing this without taking anything else - wait until you have gotten used to the accutane before taking anything else.