Breastfeeding freak out

Brittani
I know it's hormones... But I am legit freaking out about nursing! I couldn't with my daughter... I am really going to try hard with our son buttttttr I'm nervous I won't be able to, I won't give him enough, he will be sick from it.... And selfishly it's so tiring, time consuming, still can't drink or take any of the meds I'm supposed to be on.. Any advice how to keep your supply up keep a schedule going??