The medications certainly reduced your pain to quite tolerable levels. There are times that this treatment can interrupt a pain cycle and you can be much better off even in the long term.
However, if you have the same return of pain intensity and then return to the same ER, the ER doc would have a good argument to image you with an MRI or at least a CT scan.
Your surgeon would also have the same incentive to re-image you.
Donald Corenman, MD, DC is a highly-regarded spine surgeon, considered an expert in the area of neck and back pain. Trained as both a Medical Doctor and Doctor of Chiropractic, Dr. Corenman earned academic appointments as Clinical Assistant Professor and Assistant Professor of Orthopaedic Surgery at the University of Colorado Health Sciences Center, and his research on spine surgery and rehabilitation has resulted in the publication of multiple peer-reviewed articles and two books.