Gassy

Ok mamas I have cut my diet down to basically nothing so that I can nurse my daughter. She's two months and I'm starting to notice that the painful gas is only after breastmilk whether it be in a bottle or not. I'm devestated. I want to nurse her but I can't cut any more food out and still make it nutritional. Should I just move over to formula? She has been getting supplemented anyway since I don't have a big supply