Coca cola bad when breastfeeding??

Nena
 i had an appointment whit my son who is 1 week old.. I started feeling soo dizzy and lightheaded and when i was walking out of the clinic I started to feel like i was going to pass out.. The only thing i could find was a soda machine and I quickly bought a coca cola and chugged half the can just so i could feel a little better! It did help but now im scared to give my little guy this last pumped milk.. Should I throw it away??