Stomach pain?

Would like to ask if formula can cause an upset stomach to a breastfed baby? My 17 day old has been crying nonstop since lunchtime and naps for a very short time. And when he naps, he'll wake up and cries and shouts. I've breastfed him constantly today, thinking he is hungry and to stop his fussiness. He'll cry again after breastfeeding. Now, i dont know if I am low in milk causing him to be hungry or he is having stomach pains. He was given formula milk twice last night and was introduced cherifer earlier. His poop is normal (yellowish) and frequent.