DS has also been on zyrtec (an antihistamine) for a few months, and it really helped with his nighttime itching.

when i was bfing DS and cut out dairy, i saw big differences too. Over time, i was able to have small amounts of dairy without too much effect on DS, as long as his diet was dairy free. And then over time, he could have small amounts without immediate effects. There seems to be a threshold effect. Yogurt today might be fine as long as he hasn't had a lot of dairy in last few days. Yogurt 3 days in a row would result in a flare up. I don't know whether this will show up in allergy testing, or whether elimination diet is better way to assess diet intolerances.