At your age a combination of factors may be responsible for the
pain. Low estrogen
and high FSH could be responsible for
pain. Hence you must get a complete hormone panel: estrogen, progesterone, FSH, LH, prolactin, thyroid hormones and parathyroid hormones. Low vitamin B12 and vitamin D could also contribute towards pain.
The other possibility is pinched nerve. Apart from physiotherapy and pain medications, manual therapy and spinal manipulation should be tried.