Would I have a malpractice case, or discrimination? I went to the ER on dec 11th for lower back pain and shooting pain down both legs, and no feeling

In my left leg and lose of mobility. They did a CT scan and said I had bulging disks. Said to contact my doctor and have her order an MRI. Because I was a self pay with no insurance. Sent me home with pain pills and steroids. I was not able to get into my doctor. 2 days have passed and I have lost all feeling in both my legs and most of the mobility also. I went back to the ER and they did an MRI and found that L4 &L5 disks were severely bulging and pinching my nerve. They did emergency back surgery and that came out good but my nerve was pinched for so long that I have not gained sensation and some mobility back but therapy is helping, I feel that they should of done an MRI the first night I was there rather then send me on my way to make the damages worse by me falling and such. Do you believe that the ER was in the right to not do an MRI when I have already lost sensation. The surgeon that did my surgery said it should have been done the first visit and my leg wouldn''t be bad.