I am 5 months postpartum, EBF, and am generally sore and achy everywhere. I have recently started to try and get back out running (ran regularly pre and during pregnancy) but after a week or two my knees are agony! I have never had any issue with my knees nor any previous injury. The stairs are nearly impossible and even walking hurts. Is this a hormonal thing while breastfeeding? Or is it the extra weight? Has anyone else experienced this?