Hello, as you have done surgeries for L4 L5 S1. I can understand how it will be difficult for you to bend forward or low back pain. As your doctor cant do more, so its time to do something else like exercises. I think you should not plan your furure surgeries if not mandatory. even medicine or pain killer wont help you much. I would like to suggest you to start exercises and yoga. The reason of pain may be due to nerve pinching or muscle spasm. Some basic exercises will help you to alleviate your pain. start doing Quadriceps, hamstring and calf muscle streching and repeat it for atleast 2 times/day. Pelvic bridging exercise and rotate your back on both side with hip and knee bent. Hot water bag can be use to relieve some pain. pelvic belt can also be suggested to prevent jerk while walking or bike riding. hope this will help you.