Vitamins while breastfeeding !

Ana
Should I have continued to take my prenatal and iron pills while breastfeeding my supply is great I'm actually overproducing but I have been so drained and feeling dizzy and off ! I'm not sure if it's because I'm exhausted or if I'm low on something from breastfeeding !! Anyone else feel dizzy or more like you are drunk or drugged when you haven't taken or done Anything ??