Facing the reality of being in pain for the rest of my life

During my third pregnancy, my body really started to fail me. I forced myself to walk daily, but was in pain and couldn't hardly move if I had sat at all. I couldn't pinpoint where the pain was, but it was the pelvic/sacrum region.
By the time I was pregnant with my fourth, I was seeing a chiropractor for my pelvic problems that would come and go. This chiropractor took some x-rays before my pregnancy to determine what was the cause, since I'd been experiencing pain for so long. She noticed that my pelvis was twisted, and my body had grown around the twisted pelvis. She said it was likely due to trauma during my childhood due to bone growth. Thinking back, I could only contribute it to a fall I had when I was 11years old. I was leaving a baby-sitting job and slipped on their icy front steps. I landed hard on my bottom. I was in so much pain, I remember not being able to sit at school.
So, my body grew around the problem. It never really caused a problem until the stress of pregnancies brought about changes and weight and hormones and the like.
My baby is now two years old and I am in constant, daily pain. I see a chiropractor every two weeks, but I feel like what's the use? I don't feel like it's working because my body just goes back to it's previous state. Within the last year I'm dealing with massive inflamation of my sacrum. Why? Why am I suddenly always in pain? I have not changed my diet, or my habits. I eliminated dairy, sugar and caffeine for four months and felt better, but the pain was still there.
I'm on glucosamine and fish oil. I'm doing core strengthening exercises. But I can't walk from here to the other side of the room without crying out in pain.
I hate not being able to move. I hate the affect that pain has on my daily mood.
Does anyone have any advice to offer?