Hi Loza,
I've certainly had similar severity of acne to yours at various stages in my life (I'm 25). Over the past two years I haven't had quite so many of the larger, more painful cysts, but it's still an acne party everywhere on my upper-back, shoulders and centre of my chest. It's also worth noting (somewhat incidentally) that my face and neck are completely free of even mild blemishes - so I'm lucky there.
October 2011 my dermatologist prescribed me Tetralysal tablets and told me there was a 'very good chance' those would clear up my acne. Well, they haven't even improved it slightly as of yet lol. Regardless, you could always ask your Doctor about Tetralysal as they may have a more positive effect on you, as they apparently have a high success rate (my dermatologist's word). Naturally, they come with a big list of possible side effects, but are nowhere near as severe as Accutane.
Much like yourself, I wish to avoid Accutane.
What's your basic diet like? I am looking more into my diet now and how this might be connected with my back acne. My diet isn't unhealthy in the traditional sense, but there are a fair few foods/drinks I enjoy which allegedly trigger acne (cereals, chicken, eggs, milk). So I was reading about alkaline foods being good for acne and acidic foods being bad and triggering acne. Fairly comprehensive list of alkaline and acidic foods on this page:
http://www.rense.com...ns/acidalka.htm - I'm going to try and reshape my diet around mainly alkaline foods and drinks. Goodbye, coffee - ulp!
I'll also be taking onboard Wannabepretty's tips about magneiusm etc.
Best wishes!