My back has given me attitude off/on for years and years. The very GOOD news is that it does NOT sound like it's a disk (herniated) problem. Thank god, because that's the absolute worst. Hellish nightmare I wouldn't wish on anybody!
Soft tissue pain management . . . . .
BACK-TO-BASICS
GO see a reputable physiotherapist or sports injury therapist
warm-up (light cardio)
light lower-back stretches
self-massage manipulation (lying on yoga mat . . . . . roll back on tennis balls, baseballs, soft-balls, golf-balls etc)
sponge-roller
light lower-back strengthening exercises
hot shower
BONUS
professional massage
shiatsu (acupressure)
acupuncture
anti-inflammatory meds (ibuprofen)
anti-inflammatory holistic natural supplements . . . . tumeric (curcumin), ginger
pain relief ointments . . . . 'red' tiger balm
As directed, you'll be good as new . . . . promise!