Dear Welcome to HCM We understand your concerns I went through your details. People with irritable bowel syndrome (IBS) sometimes report symptoms that appear to be unrelated to IBS including lower back pain, especially during the night. Lower back pain can be caused by gas, bloating, or constipation. Medications that relieve constipation and gas may ease your back pain in the process. Check with your doctor before adding over-the-counter dietary supplements to your daily routine. Certain complementary treatments can help make your pain tolerable like relaxation techniques, CBT, meditation, regular exercise etc. If you require more of my help in this aspect, please use this URL. http://goo.gl/aYW2pR. Make sure that you include every minute detail possible. Hope this answers your query. Further clarifications are welcome. Good luck. Take care.