Should I attempt to go on Accutane a 4th time? If so what dosage?

I have severe oily acne all over my face with painful cysts on my cheeks. The 2x I did accutane it cleared up my skin when I was 13 and 15 at 50mg for 6 months. I did accutane again at 18 at 80mg for 6 months. The 3rd time did nothing for my skin except make it worse. I'm 19 and am considering accutane again even though it's been only 6 months after my last treatment. I'm on kelnor birth control, antibiotic, and 50mg of spironolactone My skin has only gotten worse. I weigh about 110-115.

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