Dizziness

Erma
Hi ladies! I wanted to know if anyone else has felt dizzy in times after they had there babies? My daughter is 11 days old today an theres days that i feel a bit dizzy/lightheaded. I am currently breastfeeding her, I dont know if it could be the cause? Or if its harmless to breastfeed in the moments i feel dizzy? Ive been taking my prenatal vitamins daily since i had her. Ive also experience shoulder an lower back of my head like intense or sore...can anyone relate to my situation? Any advice!??