Diagnosis is by typical X-ray changes, sacroilitis (inflammation
of sacro-iliac
joint in the hip region), raised ESR and c-reactive protein and
MRI of sacro-iliac joints. Medicines, physiotherapy, exercises and drugs to suppress immunity are the mainstay of treatment.
Low estrogen should also be looked into. Vitamin B12 deficiency was tested for? The vitamin D is within normal limit but on the lower range. You can take vitamin D fortified foods, and move out in sunlight more often.