Ugh. Hope you get it sorted.

I'll just add that I've been learning in the past few months that the psoas muscles are absolutely key to the whole lumbar spine and the lumbopelvic complex. Getting trigger points and adhesions in the psoas released is not in the slightest bit fun or comfortable, and stretching them is awkward, but it's made an ENORMOUS difference in my progress. Cycling does tend to shorten them, especially if you're not doing much of anything else at full hip extension.