Will Falconer, DVM Moderator
Hi Magda,
I'm sorry you're little one has fallen into such straits. I can see that your food choices have little to do with this. Why? A normal adjustment to a new food should be finished in a BM or two, three max. And there wouldn't be vomiting and loss of appetite or months of tinkering necessary.
So, what it tells me is that she's got chronic disease, the commonest kind of disease on the planet, and usually closely associated with vaccinations. The best answer I know is to get a veterinary homeopath hired to get her cured.
If you visit this page on Apoquel, you'll see a free report called Apoquel Alternatives. In it, I outline in detail how to find a good homeopathic vet to help you.
You're not doing anything wrong. But curing chronic disease is rarely accomplished with diet alone, and it's rarely DIY (do it yourself). When she's cured, she'll be able to eat anything w/o a problem, have no gas, and be healthy overall, even after treatment ceases.
Worth pursuing! And good luck. There's a light at the end of this tunnel.