thank you for sharing your complain, dear friend your pain seems mostly muscular type but if radiates from back to pelvic area or associated symptoms like burning/difficulty/frequent urination you should keep in mind possibility of renal stone also. your pain is from atleast last 2 months so i think once you should go for sonography of abdomen to ruleout other possibilities. if reports are normal no need to worry. for pain you can take analgesic like ibuprofen or for severe pain take muscle relaxant medicine like combination of aceclofenac+paracetamol+chlorzoxazon. for muscular back pain exercise and physiotherapy will be much helpful to you. -exercise for low back pain- raise your lower extrimity sraight from hip joint without bending from knee after sleeping on back and then put down slowly. same exercise for other lower extrimity and then raise both lower extrimity simultaneously. sleep on abdomen and raise your head and chest backward. do all these exercise daily by increasing everyday. hope this answer will be helpful to you. for more queries plz don t hassitate to ask. get well soon dear friend