Hi! Sounds like my youngest dd. She had a milk protein intolerance and would react that same way (gotta love that projectile vomiting!) if I had any
dairy at all. Being a self-professed cheese and milk freak myself, this was a difficult food group to cut out! It did make all the difference with her though. The few times I had dairy products without thinking (umm, ice cream, anyone?) she reacted rather quickly.
Be careful to balance your diet so you are not going to end up with a nutritional deficit yourself as a result. Find other ways to get your calcium and the proteins (much easier) without upsetting little one's symptoms.
It isn't too hard, though. A little patience and a some trial and error will get you through it!
Any other ideas, Mamas out there?