Abnormal bleeding - endometriosis ?

Hi I'm 23 years old and for the last two years, I've been suffering with abnormal bleeding. My periods have been regular, but very heavy since early teens. I bleed every day and times get sharp pains in my abdominal area or my vagina. At times when I miss a couple of days of not bleeding, I get bleeding from my bottom. I haven't been able too have sex as very painful and bleeding occurs even with stimulation externally. I had a examination from my doctor. Which was very painful, my cervix looked clear she said. But a lot blood formed. Since then, which was three months ago, my periods have stopped but abnormal bleeding still ocurring. I jus recently have started a period. But it was so painful, I went to hospital. High dose painkillers was given but wouldn't touch the pain, just made me drowsy. I recently became aneamic due to the amount of blood I lost. I began to get pain in my pelvis when opening my bowels but regular bowel movement. No straining done. I get pains in my thighs and my stomach. Recently in the last three months the pain has increased. Any advice? Alex