hemlockjibber8light stretching when warmed up. be very careful about stretching too hard and causing it to react badly. electronic stimulating acupuncture is good as well.
Park_RangerYou should start practicing yoga on a daily basis. Outside of the countless mental benefits, it is really good for opening and strengthening your lower back. Additionally, nearly every yoga pose has some sort of focus placed on your core. Your core helps support your lower back; strong core, happy lower back.
I recommend getting a yoga block and playing around with a few of these exercises:
SessionYoga has literally changed my life. Not in some existential woo woo kind of way. Just Physically it makes up for my age, and desk job.
Profahoben_212I had a stress fracture in my L5 that felt like you are describing. Could be worth bringing up to your doctor.
I went to a couple doctors who kept telling me it was muscle and to do stretches/workouts on it....which just made it worse. Finally went into a MRI after like 6 months and I had one hairline fracture and one that was almost considered a break.