@crimsonclad, I have an old traumatic back injury that results in a frozen sacrum and gets a bit more cattywhompus moving up from there, and my sacrum or pelvis will click in and out, or pop, at certain angles...

the most helpful thing I have found for me is called "spinal release yoga," or sometimes "therapeutic yoga"... it's very simple and gentle, we might do 4 laying down postures in an hour and 15 mins, and it aims at actually releasing muscular tension at a deep level, rather than stretching or building muscle. It has been amazing for my hips, lower back, and, thusly, the rest of my body... might be worth checking out if available where you live.

The other thing that has helped me a lot is the Gockhale Method, a postural method, and the book 8 steps to a pain-free back, which is about what you can do passively to return your spine to alignment, whether reclining, sitting, walking, etc. etc.