PLEASE HELP how to increase breast milk supply

PLEASE PLEASE help I’ve switched around formulas and nothing works good for baby. He keeps moving around like he’s got a tummy ache after formula. Fussy, gassy, and in a lot of discomfort. When I pump enough milk to give him for a feeding HES AMAZING. Not fussy and sleeps so well. I pump often and pump about 10-15 ml in one session. I tried milk makers lactation cookies and pumped like 20ml but they make me so sick and stomach aches so bad. Anything that works good and gentle?