I have another idea that might help. There is a prescription for topical cream that contains the same ingredient in accutane. It contains 6% accutane in an emollient base.
I have been on Accutane twice. I took pills orally. Within a month, my greasy, oily skin had turned to a nice dry desert. The problem is that you have both dry and oily skin. That is where topical accutance might work because you would only apply where the skin is oily.
Accutane requires a prescription. And because it is an ointment that a pharmacist would prepare, an apothecary might be a better place to fill the prescription. I have called around my town and only apothecaries will fill the prescription here.
I haven't tried the topical accutane yet - maybe next summer. But if it works half as good as oral accutane, you will love the results.
One other thing, on oral accutane, there is blood work required monthly. May or may not be with the topical.