Accutane is a voluntary treatment. The patient always has the basic right to decline a treatment. If you feel worse taking it, then you can refuse it. You don't need a doctor's permission to refuse a treatment. Now sensibly if it were a cardiac drug or a drug for seizures, or diabetes, you'd have to defer to your doctor's opinion in a much different way.

If the general public knew how little doctors get training on DRUGS they would be horrified. Typically doctors within a specialty do not know about other drugs. I used to have doctors come in on midnights and ASK me what a certain drug was for and how to use it! There are doctors out there who do not know how ibuprofen works, or what the abbreviation NSAID means.
In medical school they get one class on pharmacology as a rule.

A neurologist who doesn't know that Accutane potenially can cause pseudotumor cerebri (increased intracranial pressure)? That is pretty scary. The main presenting symptom of this is headache. Are your doctors ignoring your headaches too?