I have low back and one right side muscle pain since one year but this pain starts only 10 days before my period every month. The pain is like comes suddenly and after few min it goes by itself. Did usg but everything is ok and blood test found vit d, vit b12, and iron deficiency. Taking supplements since two months but still not getting relief. Is this gynic prob or if it is due to deficiency then why it is not pain whole month but only jst before 10 days of period.