Steven, thank you for the article! The good news it seems to be a very bad muscle strain. I tried some of the exercises and while doing the "camel" of the cat-came it provided a tremendous (and painful) stretch of the muscles. Now I'm wondering if it's possible the pain caused by flexion is further accentuating my hyperlordosis and that's what leaves the "compressed" feeling in the spine that gets worse over the day, as I'm walking around and upright.
Donald, that is a really good point, I do have insanely tight hip flexors and quads. I've been working on stretching them for a while now (even prior to the injury) but have seen little progress. I'll keep drilling it.