Acne is stubborn, I know. It can have 1 cause or multiple causes, and for everyone it is different.

Some things to try: colon cleansing (I like Oxypowder for this), parasite cleansing (I like Humaworm - drink lots of water while parasite cleansing, same with colon cleansing), and cleansing your liver and kidneys. It's especially important for you to take care of your liver because you have been on Accutane and many other drugs. The problem with drugs is that they're not natural, and because your liver doesn't know how to process them, just become toxic in your body and pollute your liver. You might want to try juicing (fresh, raw juicing - there are lots of juice recipes that can cleanse your body of toxins) and Liver Cleansing herbs like milk thistle and hydrangea root. If you go to Dr. Hardy's forum and ask, he can give you a gentle recipe for a Liver Flush to cleanse your liver.

Also, have you tried cutting out grains and dairy? Those are common allergens that can cause acne. Same with meat - cut it out for at least a month and see how you feel.

Watch what you put in your skin - chemicals can irritate acne, as can make-up. Keep your skin routine simple and keep your skin free from make-up as much as possible.

You haven't explored all your avenues yet - don't give up hope :)