I think it's good that you can walk 2 miles no matter how slow it is. I probably can't walk more that 2 or 3 blocks without resting some. It's mostly because it's hard for me to walk normal with good posture. I lean forward quite a bit which I think is similar to camptocormia or bent spine syndrome. I don't have any real pain but do have some ache and pressure in the lower back. I'm the guy that loves to push the shopping cart at the grocery store because it helps me walk 🙂 I did purchase some inexpensive Nordic trek poles that help me walk more erect if I want to walk around the neighborhood. I've heard some members have had good luck with Myofascial Release Therapy (MFR) and there is a discussion on the topic you might want to take a look at -- https://connect.mayoclinic.org/discussion/myofascial-release-therapy-mfr-for-treating-compression-and-pain/

Have you heard of Myofascial Release Therapy?