Please help! Comfort milk

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So my girl is almost 5 week old, I had her on cow and gate stage one milk, not sure if this was down to the milk but she was really windy, seemed so uncomfortable pulling legs up, grunting, crying always farting to! Was told to get gaviscon first, tried that didn’t seem to work, next tried infacol and that didn’t seem to work either, tried dr brown bottles, different teet sizes ect and nothing seemed to work so I’ve tried cow and gate comfort. For the first 3 days it seemed to of worked a treat! Overall a lot better than before! But today she seems to of been a little grunty, and bringing legs up again, and a little unsettled! She also seemed to struggle poopping (she did before I changed milk to) and when she did poo it was green and looser, I know this is normal but for her to struggle still is this normal? I don’t understand how she can be so good on it for 3 days and then just all of a sudden seem uncomfortable again?! Can I have some advice 😩 just want her to be comfy!