Why Do I Still Have Headaches?

Name is Jack (44yr, male) I was in an accident where I was hit from behind by a fully loaded semi (June 1, 2011). I was at a stop in a construction zone on the interstate and was rear ended by the semi that was traveling at 65mph. etc. Nothing broken (they took x-rays), but per the doctors here, I was told I have a bad case of whip lash, they did a MRI of my back, (I have the Report and MRI photos) I have a few problems that where found. T11-T12, L3 - L4, L4- L5. Bulging ranging from: Tiny, Mild, to Moderate in size, also some protruding into the core, and some minor tearing. I have Numbness in my left leg (when it’s bent for more then 10min), left leg is weak and I can not pull my left foot up to the same level as my right leg. Problem in the left hip area, lower back to mid-back area, along with upper back area and the back of neck, I have headaches’ that won’t go away, my head feel like someone is knocking me in the head with a hammer, and my neck is in consent pain. Feel like its on fire and someone is pulling my hair and hurt to turn my head. I have trouble sleeping at night, I’m lucky to get 4hrs of sleep a night and when I wake up at night my arms and hands are numb. It’s hard for me to seat and stand for long periods of time; I can only walk only for about 2 blocks. They have told me, I’m fine, but they want to do injection (steroids) in my back. Does this sound about right to you?? Why do I still have headaches??