Doctors will keep telling you to take it because it will clear up your acne - but for a limited time. Doctors only see acne in very simplistic terms when in fact there are multiple causes of acne depending on the person.
I have hormonal acne and I have been on various birth control pills - none of which helped my acne at all. I have also been on accutane twice. Both times it cleared me up for around a year until my hormonal acne returned in full force (cystic acne along my jawline and lower cheeks). It is up to you what you decide - Accutane will work and does have the potential to have permanant effects however, no one I have spoken to who suffers with hormonal acne finds it cleared them up permanently. You have to decide on whether the side effects are worth taking the chance.
I am clearing myself up using herbal supplements that seem to be having great effects. I was diagnosed with PCOS and so take Vitex to regulate my periods and Saw Palmetto to lower the excess testosterone as well as evening primrose oil and zinc for overall skin health. I don't know whether this is an option you would consider? There are loads of natural supplements that are quite potent and effective and if you do the research you can find out things and tailor a plan to suit your specific needs.
I have a blog on my experience of my second course of accutane if you decide you want to go through with it and can answer any more questions you might have.