Asana for low back injury and pain

I have a history of low back injury and sprains\strains and probably somewhere along the way some disk damage. About once or twice a year I over do it just a bit and it will take me out for a day or two…a month ago after a week of solid training and some furniture moving for a yard sell I woke up one morning to intense low back pain, sometimes with pain down my legs or up high in my right hip,other times just stiff and to point around L5 or L4…
It has now been a month with relief for only a few days..while I was on a cruise ship..
I am a athlete, personal trainer, and have even taught yoga..but so far no relief though I fair better with activity than without.
Flexion does hurt though a bit tight..extension like cobra is difficult..though maybe a good thing to do.

Would be interested in others perspectives and suggestions, esp. that of teachers.