Get a back brace. I had some bad lower back pain couple years ago. This thing made me functional for those days. Helped a lot.
https://www.amazon.com/Back-Brace-Sparthos-Breathable-Adjustable/dp/B071G33DC1/ref=mp_s_a_1_4 

 Of course this is a temporary solution. Long term solution revolves around strengthening muscles and stretching.