I really feel you on this, it is so worrying when your little one is vomiting most of her feeds and sounding so congested. The switch to stage 2 could be a factor, but vomiting that frequently at this age is something worth getting a PD to check out properly, just to be safe, rather than trying to troubleshoot the formula alone. About goat milk formula, I have heard other mums mention it too but I honestly would not switch without checking with your doctor first since every baby reacts differently. Bring her to your PD soon and describe exactly how much she is vomiting and how often, so they can rule out anything else going on beyond just the formula change.