I feel the same. This back injury (L5-S1 disc protrusion) won't go away.
I started with a funky case of arthritis in my AC joint took a few weeks off with meds and let it die down. It was waking me up at night often. I have degenerative arthritis in both my AC joints but my right one doesn't hurt at all. Thsi was june of last year.
I had pain in my leg for sometime before the AC joint but was training through it. I was still lifting and making progress. Then it just got to the point of waking me up, not being able to walk without a limp, and constant pain in my knee, calf, and heel.
Ironically my wife had the same L5-S1 disc injury but hers required surgery. I just put mine on the back burner and took care of her.
I finally went to the Dr. in Feb. for my disc. After meds and observation the pain was 75% better. I went back in and started the program. Did a week and a half and the pain comes back. More meds and rest. Finally the pain was 100% gone except some burning in my heal. But that's no big deal. The Dr said I'm good to try weight again. I go back in yesterday with my wife and try to teach her some lifts and bam I have pain in my foot and calf and I didn't even lift the bar more than a few times. I feel like it's never ending.