Kindly take rest and give your back the time to recover from the burden. As it is the best treatment for acute back pain. Take liquid diet like daliya, mooong daal soup, plantains, khichdi. Take warm water at least 3 liters a day. An take ashtavarga kshayam 30 ml twice a day with warm water, empty stomach. Do gentle massage with vishagarbha oil (warm it) and do hot fomentation with water bag. Take myostaal forte, 2 tabs twice a day after meals (chew the tabs for best results). Continue the regime for 15 days, and do take rest on flat bed. Avoid bending instantly, lifting heavy weight. Good luck.