hi, thank you for providing the brief history of you. A thorough clinical examination is advised. As after any fall there should be a thorough clinical examination done and also the x-ray but since it is not done I am really unhappy by the approach. Well, as per your symptoms what you mentioned I feel there is some Sacroiliac joint issue or may be spondylolisthesis. Only taking an MRI scan we can come closer to the diagnosis. As you mentioned that post walking a couple of distance your pain is eased I feel this should be case of spondylolisthesis which gets diagnosed pretty late many of the times. in my clinical practice, as soon as I receive such complaints I advice straight for an MRI as having a proper diagnosis and patient satisfaction to the health management is my first priority. I will advice you the same to take an MRI. treatment can be simpler with physical therapy and some specific exercises. Regards Jay Indravadan Patel