Result of a work injury in early 1990s while cleaning fish tanks.
Things done, which help, but don't fix:
Exercises, which sometimes get forgotten for a day to a week.
Occasional physical therapy.
Occasional medication to frequent medication, the thing is variable for some reasons known and some reasons unknown.
(who knows, could vary with the price of cat food in Keokuk divided by the square root of the moon phase)
And ...
Believe it or not ...
Watching what I eat ...
... having inflammatory bowel disease, it seems the inflamed, swollen, bowel will push on the lumbar injury site and cause increased pain.