Am I eligable to become a Green Card holder?

Hey, I am very interested in getting my Green Card. I have had a couple of injuries from which I still suffer chronic pain from. About 4 years ago I was struck by a vechile traveling at approximently 30 MPH, my left leg was luckily my only injury being a severe fracture. Two years later I was traveling on a Trek racing bike down a fairly large hill reaching speeds around 20-25 MPH when I hit the tiniest pot hole and got the "high speed wobbles" and landed on my wrist snapping it out of place and breaking. I didn't know the injury was that serious at the time and I never received medical attention. However I got x-rays of my wrist months later and it was determined surgery was indeed needed to fix the fracture. I do not have insurance any longer and cannot afford to buy perscriptions for pain medications and frankly I do not like taking pills. To add to my history I have recently in the past year and a half been experiencing lower back and mid back pain excessively. Are these serious enough symptoms for me to be issued my green card? I currently self medicate with marijuana and it eases my pain perfectly.

Thanks.