My son had symptoms like that. He was windy after every feed (breast or bottle) and would pull his legs up in pain. He had constant diarrhoea, dry skin and congestion. The GP initially said it was colic but I did all the things you did and nothing helped. The health visitor suggested CMPA and I went back to the GP and insisted on hypoallergenic formula when he was 8 weeks old. Since being on it, all his symptoms disappeared within 2 weeks. We tried normal formula a couple of weeks later (GP requested it) and his symptoms came back so that confirmed the allergy. There are a range of formulas. I was given Nutramigen which he settled really well on but when it went out of stock, I tried Athera and his symptoms started coming back as it has more cows milk protein in it compared to the Nutramigen (even though they’re both hypoallergenic).
I would say definitely could be CMPA my boy had symptoms like this and as previous comment had eczema and very bad poop and could have been perceived as colic for the most part, I had to fight my sons case to 3 GP’s then HV contacted them telling them that they needed to help before they listened. Your HV should be able to tell you what your local guidelines on CMPA is and you can use that at your GP!’s if they don’t listen xx
Those are some of the symptoms my little one had. Eventually he got diarrhoea and had eczema. Speak to the gp asap so they can change her milk, advocate for her if they refuse to!