My back still hurts

So for anyone who doesn't know me I have serious back trouble. It all started when I got hit by a bus while I was in Mexico in July 2003. (Contact me if you don't know the whole story. Its a pretty good one that I love to tell.) Now my back doesn't hurt everyday but it hurts more often than it doesn't. I try to keep to myself about when and how much it is hurting but sometimes I just can't. So practically everyone that I know has been telling me that I should go to a dr and get it checked out. So I finally did. I explained that I was hit by a bus in Mexico and that it has been giving me trouble ever since. So he sends me to get an x-ray. (Yeah, been there done that the night of the accident. Can you be a little more creative please.) So I play along with his silly little game and come to find out my x-rays are pretty much perfect. (Yeah I knew that already.) The only "abnormality" is that my spine is straight where most people have a slight curvature. But that is not really relevant at all. So the dr diagnoses me with a "cronic back sprain" (4 and half years of cronic back sprain, really?) and refers me to a physical therapist so I can learn some exercises. (I don't need no damn exercises!) My mom, having just been through her own saga of back pain, thinks I should call him back and ask if an MRI might be beneficial. I guess that will be the next step. In the meantime my back still hurts and I'm pretty sick of it.