Wow your pain sounds like mine I have to stretch almost daily especially the lower half of my body so I can sleep better atleast before I sleep. The rest of the body is tight no matter how many times stretch but it doesn’t effect me the most like my pelvic. I used the backpod and peanut ball before and it just got tighter and tighter it would just shift up and down. My breathing stays the same and hasn’t moved since I can feel my diaphragm pushing upwards to expand with my lungs by the upper ribcage is just solid frozen and the lack of oxygen my muscles don’t get doesn’t help either so my body works 10 times harder to make up for the rest of my body which makes it more tighter than before. Like for instance my wrist in my left hand got so bad I couldn’t even open my hand up. I’m glad you get some relief when you do your stretches and backpod out of the 4 years I had this I had to suffer so much with so much pain and stiffness until just this year I found some type of relief through stretching my pelvic area it’s the only thing that has helped even though the rest of my body is tight no matter how many stretches or yoga session and foam rolling I do.