Hi Lisa,
Sounds a lot like teething to me - my DS was exactly the same, but fortunately he managed to cut all his teeth before his 2nd birthday, so that makes it easier to tell when he's having a food reaction
I deliberately went for a reasonable dose of the new milk as DS isn't as reactive as DH - basically because DH's gut has had 39 years of major damage and DS's only had 5 months of relatively minor damage from milk proteins (I BF and avoided dairy after 4.5mo).
DS can tolerate 1 small goat's yoghurt per day (at breakfast) but recently has not tolerated goat's cheese in addition - I now know
exactly what his poop goes like when he's having a reaction
Still so far so good - no more poop today and he's been his usual self, no eczema flare-ups either
I will have to see how he is in the morning to be sure, but of he's still ok I'll get another 4oz into him and see if we get any cumulative reaction later in the week, continuing with a small morning quantity of a2 milk
Hope you get some good results too