hi - sorry to hear that the gp wasn't helpful Is there another one you can book in to see? I guess I was lucky that mine was so quickly prepared to admit that she didn't know enough about it to advise, and referred us. LazyLinePainterJane is right about the fact that a lot of GPs won't take it seriously, unfortunately there is a lot of confusion and lack of info in this area. I kept getting health visitors banging on to me to feed DD lots of cheesy sauces to make her put on weight, grrrrr...
If you haven't done this already, I found it was helpful to put down in writing exactly what happened with each episode (age, what she ate, how soon sickness followed etc) and stick this in front of any medical professional you see. It was from this rather than any tests that the paed made the diagnosis. She said that there are no useful tests that they could do as eg a skin scratch test would only show a skin reaction, not a gut reaction, and it was the gut reaction that was the problem.
Is your DD generally a 'sicky' baby? Just wondered as my DD really isn't - since she was around a month old she has only ever been sick when she had a bug or when she had dairy, she can go for months without being sick normally, which made the allergy more obvious and easier to diagnose.
There are quite a few threads on Mumsnet on dairy / cow's milk intolerance / allergy if you do a search
eg
www.mumsnet.com/Talk?topicid=29&threadid=533549#10877617
www.mumsnet.com/Talk?topicid=29&threadid=451070#9155925
www.mumsnet.com/Talk?topicid=1364&threadid=266147#5333962
There are tons more as well
Here are a couple of other sources of info
www.cyh.com/HealthTopics/HealthTopicDetails.aspx?p=114&np=302&id=1785
Not to be confused with lactose intolerance:
www.breastfeeding.asn.au/bfinfo/lactose.html
Re diet, I never made white sauces, but I think you can could probably try it using rice milk and a dairy free spread. Dairy-free weaning food can include things like lentil and root veg casseroles, avocado, banana, eggs, minced lean meat/chicken/fish with veg, rice, frozen peas & sweetcorn, mash made with olive oil, bread with olive oil. Hipp Organic do lots of dairy free jars which aren't bad, I always chose ones with meat in for the protein.
DD was prescribed Nutramigen which I mixed with Farleys soya formula to make it more palatable (though if they will take Nutramigen on its own that's preferable). Not sure but I think she started having this at about 10 months to supplement bf as I was back at work.
sorry this is a bit rambling, if anything doesn't make sense let me know !