My daughter screamed for the first 3mths of life until I took her to a naturopath who said she was dairy intolerant so I cut dairy out of my diet and she was a new kid. I was able to continue breastfeeding which I'm thankful for.

Did he do any further testing or just go on symptoms? As to me that is wrong just to advise formula without trying other solutions first. Especially as true lactose intolerance is very rare.