My daughter is 2 and a half weeks old. She has progressively been crying more and more after and during her feeds. She is formula fed. We’re on lactose free milk as we thought she may have an allergy. She screams & screams & I have tried everything to reduce this including infacol, various burping methods, a swing chair, tilting her cot, we’ve taken her to the docs after she had green poo, who checked her over and apparently she’s fine. The constant screaming is getting me down and I fell so useless that I can’t help her and calm her down. Any advice would be welcome. Thank you.