I used to think I had an allergy to milk. Then I discovered that I might actually be allergic to seed oils that contaminate the milk via the feed given to the cattle. Also, there is A2 protein, from jersey cows, that is said to be less irritating than the usual Friesian black and white cow. And then there's goat and sheep milk, sheep is very high fat (6-7%) and goat moderately high fat, but high in MCTs and with fat globules small enough to emulsify naturally and not require homogenisation.
Another thing I discovered was that eggs, which have a lot of cholesterol, are also problematic due to being fed on unnatural seed feeds for the chickens. This gave me a skin allergy and upset belly for literally 25 years. In addition, it was giving me gall stones, which I think that part of my former alcohol addiction was all about burning that cholesterol to make hormones.
Just wanted to share that because you may not have realised that milk might not be as allergenic as you thought, may not be the actual cause of your allergic reactions, at least not wholly, or maybe not at all.
Milk is amazing food. The perception that it is bad for you largely stems from the fact that it's direct competition to seed oils, and distracting you from exploring the idea that other causes, that the big megacorps are profiting off, while soft-killing people and diminishing their lives, they do everything they can to muddy the waters and piss in the pool.
Lactose intolerance is actually quite rare in people who have substantial indo-european genetics, and the mutation that allows adult humans to tolerate lactose sugars first appeared around 40,000 years ago, basically it's a switch that most mammals have that turns off after some time after weaning.
It was this mutation that led very quickly to humans herding cattle and breeding them from Aurochs into the modern, sedate and passive animal we have today.
I'm drinking a lot of milk lately. I wish I could have unpasteurised raw goat milk but maybe next year I can get that organised.