I know what it's like feeling like you're going crazy with it. I worried I was imagining the symptoms , being a hypochondriac, etc. This was also because nobody else including my DH thought there was anything wrong. Just usual 'colic' and apparently harmless spinach green gungy poo. But I knew. Deep down, and when my dd screamed while doing these tiny, very frequent explosive snotty poos, she looked in a lot of pain, and would be so shattered by it and fall straight asleep.
In our case, the GP was not helpful and said nothing seemed wrong, I was just a naive first time mother. In fact several HCPs said the same.
Keeping the food diary was the key for me and then when, post weaning , I tested my daughter with some cooked cheese in a lasagne , and she reacted the same way as she used to, it was a sense of relief to know that I had been right in my gut instinct to exclude dairy and a number of other things, based on this food diary.
So don't hold high hopes for support from your GP, but give it a shot.
You may or may not have the allergies confirmed by testing , allergies are complex and unpredictable . First step is being referred to a dietitian by the GP. You may need to be a little pushy,
Oh and definitely try and avoid soy entirely before removing eggs. They are such excellent quick nutrition when dairy free. To avoid both milk and soya you essentially can't eat any processed food at all.
On the bright side, you'll probably eat better! I lost all my baby weight and then some . Unfortunately put it all back on , once my daughter could tolerate dairy in my milk around 8 months...
It won't be forever ! Check the allergies board for dairy free recipes and foods, there's lots of great advice there about cmpi and cmpa too