Hello lybrate-user, At this age, the cause of your backache might be post-menopausal osteoporosis if the pain doesnt radiates to your legs and if it radiates to to your legs than may be PIVD. Have calcium with Vit D.And for pivd then you need get an xrays of DLS spine with MRI LS spine.in the mean time you can do lumbar back exercises just as you tolerate.

Its looks like disc problem you can undergo intermittent pelvic traction where in your half of your body weight will be added in the electronic traction so that that would help you to reduce the pain, along with Interferential therapy stimulations which would help you to get relieved from the radiating pain. Apply ice for the pain to get subsided immediately. If you cannot go immediately for the physiotherapy treatment. Ice can be kept in the low back where you have back pain. It is suggestible to wear Lumbo sacral belt which would help you to build the abdominal muscle tone which itself would make you feel better. You can also wear MCR chappals which would help you to have less weight falling in the painful back.