Take a vitamin and the 5-htp supplement if you can (different things). I mean its not necessary but it could sure help counter the lack of food and sleep. 5-HTP is a precursor to the neurotransmitter serotonin, it may help raise the levels of serotonin in your brain slightly. It can actually be used to treat depression and in studies worked slightly better than SSRI medications and provided relief faster.
The multi-vitamin is to help your body maintain itself better since you probably wont have much of an appetite. Certain vitamins such as C, E and A are antioxidants that may reduce neurotoxicity and magnesium eases jaw clenching.

Accutane I remember someone asking about before, its an acne medication if im not mistaken and I don't see how it would be dangerous if combined with MDMA.