I’m having sudden pain in the left side of my lower back since evening. It is a constant pain. My lower abdomen has mild pain too. Three days back i had the problem of frequent ruination with burning sensation. It lasted for two days but it stopped after I drank a lot of water and juices throughout the day. I do not feel the need for frequent peeing now. But my left side lower back hurts continuously since 6 hours. What do I do?