How do I get rid of this persistent back pain?

Evaluation. There are many causes of persistent back pain. Most cases respond to lumbar strengthening exercises and anti-inflammatories. For persistent pain, the best recommendation is to be evaluated by a spine specialist to understand the cause of the pain, and the best way to treat it.
Core strength. There are many studies on the subject of lower back pain. The majority suggest the best method of controlling chronic lower back pain is exercise to create core strength and loose weight. I also suggest daily stretching and core strength exercises. You can find these exercises at: http://harvardneurosurgeon.Com/pt2.Html.