I became drug addicted whie I was treated in the hospital

hey, I need your help because I have really serious problem. As I had very serious car accident and I was in a great pain the nurses in the hospital were giving me a lot of drugs. t was a long period and I was given more and more painkillers.
After leaving the hosplat I couldn't find a place for myself. I went to the doctor who prescribed me some medicines. It was not helping. The problem was growing as I was anxious and nervous all the time. I couldn't even sleep a wink. When I asked doctors for stronger medicines and my doctor denied to give it to me I was so angry that I started shauting at him. He told me that I have a serious problem...
I started taking drugs. My life has changed completly. I dropped frm the college even it was the last semestr. I left my family. My friend and boyfriend were fighting for me and they sent me for the drug rehabilitation. I lost over 2 years of my life. I thinkk that the hospital is responsible for it. How to claim? How to proove it? I really long for the advice.