Girls, there are so many articles, I don't understand who to trust) it…

Girls, there are so many articles, I don't understand who to trust) it's been almost a month, it seems like colic started, in my tummy it constantly cries. We give Eспумизан, it's unclear if it helps... earlier she slept for 2-3 hours without problems, now she cries a lot, I feed her every 1.5-2 hours, I think there isn't enough milk... So, the question is, do you stick to diets while breastfeeding? What foods should we eat to have more milk? What do you give for colic? My baby was calm and lazy before, now it's become difficult, often cries, sleeps soundly.