Is accutane being absorbed in my body?

I read that accutane needs to be taken with a fatty meal, so after a meal, I swallow 3/4 of a shot glass of olive oil and then I take the pill. Does taking large doses of oil affect the drug absorption in an way or should I just stick to other sources of fats - like almonds? Also is it common for side effects to come and go. Around January, my skin was excessively dry and it started to peel. At the moment it feels smooth but non oily. Obviously the dry lips have been constant.