I have suffered with low back pain all of my life "literally". After years of physical therapy which did nothing for my pain, I finally met a pt who gave me invaluable advice. Ice the area the pain originates in 20 min on and 20 min off. The best ice-pack is a "bag"of frozen kernel corn, peas,or lima beans. Always keep two bags in the freezer. Take one bag out and whack it on the counter to loosten up all the veggies. Then, wrap it in a kitchen towel and put is on your back. If you cannot lie down, take a scarf or a belt and tie it around your waist. 20 minutes on, 20 minutes off. You will see how much better you feel after a short while. This also works on sciatic pain