Expressing your anger is an opportunity for you to speak clearly and honestly and enhance your relationship with your child. Unless kids see their parents or role models expressing anger, they won't know how to do it themselves.
I am big believer in breastfeeding. My oldest was breastfed for 9 months, my second for 6 months and I will try to nurse Kayla for 6 months. At the end of the day, it's a big sacrifice but you have healthier kids.