My chiro neighbor recommended doing the "cobra" yoga stretch. It worked for me.
NOTE - No medical advice below either given or implied, just suggestions to explore and verify for yourself.
Was coming here to say this. A Western, PT/chairo version of essentially this can be found in the thin book Treat Your Own Back by Robin McKenzie (sp?), with something called the McKenzie Extension.
It makes sense. Bio-mechanically, if lower lumbar vertebrae (generally L4 & L5) are front loading on to the disc, whether from postural/slouching issues, and causing it/them to squeeze and bulge out the back, thus impinging on the nerve (in which even minimal contact can cause extreme pain and loss of nerve function), it might be expected that an EQUAL and OPPOSITE bio-mechanical action could effectively reposition and center the disc (note - if posture/slouching either caused the problem in the first place or exacerbated an existing condition, it is obviously important to be vigilant about not reverting/relapsing back to a source or fundamental root cause of the problem in the first place).
Exceptions might be if the impingement isn't coming from front to back but more laterally/side-directed, than an opposite stretch of THAT would be in order, and there are licensed McKenzie Therapists.
Someone I knew had chronic back pain for years and surgery seemed inevitable, he did the exercises, nothing changed immediately, luckily he persevered and made a breakthrough after approx. one month to five weeks.
* These don't involve a massive commitment or investment of time, maybe 5-10 minutes once or ideally twice a day?