Both of my kids had cows milk sensitivity. It seems their symptoms got worse before they got better it took a while to see dramatic improvement. I read in some cases it can take up to 4 weeks. Watch out for foods that are "milk free" but have specific milk proteins in them whey, casein. For example, nondairy creamer has milk protein in it. Check the labels do some research.
Milk is the most common allergen in infants, but other foods can be a problem too. Other common foods are soy and eggs. Also, there are some studies that have linked reflux to a symptom of cows milk sensitivity. Keep up all the hard work. You are not alone in this. It gets better!