FEED ME!

So, Jack will NOT take a bottle. My milk supply is diminishing fast and I can't supplement. We've tried different kinds of formula and bought several different kinds of bottles. He SCREAMS when we try to give him the bottle. He cries after every time I'm done feeding him, though like he's still hungry. He wakes up ALL night long to eat. Way more than ever before. He was also sick again last week...but he has lost a half a pound. I DON'T KNOW WHAT TO DO! ANY HELP?!?!?