So overwhelmed after doctor apt

So today my son turns 2 months took him in to get his shots & check up. When he was born he weighed 7 lbs & now at 2 months he weighs 10lbs. I'm EBF & now doctor said I'm most likely not producing enough milk for him to give him formula but he refuses to take a bottle. I feel so overwhelmed now he keeps screaming because clearly he's hungry & he wont take it, I feel horrible that I failed him😭😭😭