Help please

My baby boy has been nursing and bottle feeding breastmilk and he’s 2.5 months old. I started working out and eating healthier and since then my milk supply has dropped significantly. He also eats anywhere from 6-8 oz at a time and he’s STILL hungry an hour or two later. He can’t even sleep more than 2-3 hours at night because he’s starving. I just can’t keep up. I’m having a hard time dealing with the thought of giving him formula and just wanted some opinions. I’ve already seen a lactation specialist and I know how to nurse and pump but I just don’t produce as much milk. Especially for his eating, I feel like he’s drinking water and then hungry 10 minutes after lol