What Can I Eat/Drink to Boost Milk Supply While Being Sensitive to Dairy

I used to take milk for pregnant/lactating mothers, but had been getting the runs + gas postpartum from consuming milk products. (Now at week 4 going to 5th) And had been producing less breastmilk recently as I am very lost on what alternatives I can take to increase my supply without drastically hurting my wallet. (I find the ones available in the market are a little on the pricey side.) Would like to seek advice on what alternatives that are safe for post C-section I can get in Singapore in order for me to be properly supplemented? Do let me know too if I do need to seek medical advice from the digestive issues too 😭 #FTM #advicepls