supplementing formula? need help

Lauren
My 2 and a half week old has been mouthing, screaming and throwing himself around for two days. He had his tongue tie snipped two days ago and I feel now is able to get more milk, but it looks like I'm
Not producing enough. I finally fed him 2 oz for formula after hours of constant feedings and he has calmed down and fallen asleep. Any moms successful with breastfeeding and formula? I don't want to give up feeding but it's not fair to make him suffer because I want to exclusively feed. Poor guy was so hungry. Looking for advice!!