Breastfeeding 🤱

Hello Moms,

I been having a problem 3 weeks ago I had my baby via emergency c-section my baby is still in the NICU. My mother in law that, I love dearly has came to help me , but she has been like don’t eat this don’t drink that . The baby will be colic with the milk everyday I drive to take my baby breast milk . My question is can i drink milk while breast feeding ?? What foods do I avoid, I hear and read different online ??