I have had a similar experience, my daughter is now 8months old. I have never had the blood test but went to see a gastro pead at The Portland, who diagnosed. She had eczema, congestion and was sick lots. At the time I was EPF and dropped all dairy from my diet. The change in her was quick and her symptoms much relieved. Weaning has been fine, I introduced all new foods slowly and have now introduced yogurts and cheese... All fine. Most children grow out of it, I have been told. I am now using Aptamil Pepti formula and all is okay! Probiotics... I use Udo Blend from health matters, used when I started to wean and will use again when if she is unwell. Yummy Baby, Jane Clarke is a really good book about all things food and baby! Hope this helps, feel free to PM me Annabel