Hello! Baby is 3 months old and very fussy, only drinks formula from a…

Hello! Baby is 3 months old and very fussy, only drinks formula from a bottle, calms down only when I hold her with a support. I've taken her everywhere, but it doesn't help at all. She cries as if she has pain somewhere. I feel it. We haven't found a normal doctor yet. All ultrasounds are normal (head, heart, kidneys, stomach). Last chance to change the formula, I think she might not be eating enough, although I'm not sure because she gains well (6.5 grams). RECOMMENDATION: WHAT FORMULA DOES SHE DRINK? We use Nutrilion Premium.