First thing I have to say is, poor u
I totally sympathise with ya as I used to have awful acne myself. It really got me down.
There is only one option if you have tried everything and that is to go to your doctor. First I tried something called Oxytetracyline (tablets), they were orange tablets that worked for a while then stopped working...
So then I moved on to Erythromycin (sp?), or something like that, little tablets with "E" on them... they worked but again only for about six months...
I then went to see a dermatologist and he diagnosed me with having extensive acne. He put me on a new drug called Roaccutane which is like a massive dose of Vitamin B, and I don't mean a supplement, it's a big dose. The drug was kinda on trial and I got £500 worth of the stuff for nothing on the NHS. It worked, but the side effects were quite bad... the first three months saw me with desert-like skin, seriously my skin has never been so dry. The first couple of weeks saw me with the worst acne I had ever had but the dermatologist said it was normal and would get worse before it gets better.
Other side effects included migraines, jaundice and mood swings.
But if you want to get rid of your acne, that's the way to do it, it is a last resort. I have no regrets going on it except teh fact my back is a bit dodgy for spots, the rest is pretty much ok and loads better than what it was, with very little scarring.
But yeah, see your doctor, get an appointment with a dermatologist and they can disgnose how bad your acne is and what treatment u need,
Hope all goes well