Is it possible to retrain your body to handle different foods??

Sometimes all it takes is taking the right probiotics for about a month or two. What you say is interesting though because what I saw more often were warnings that eliminating something from your diet might make your reaction stronger if you eat it again. I was diagnosed with cow milk allergy but I never had any consistent problems with dairy. So when I read that eliminating milk completely might make the allergy worse, I said no way.

Our bodies can fluctuate and change over time I've noticed. I started not being able to eat onions, it was devastating lol, but then after I had a hysterectomy I can eat all I want! Bodies are weird.

You are lucky. I have a slight case of lactose intolerance.
But I need my 1/2 & 1/2 for my coffee. And have cheese at times with sandwiches and burgers.
So, I suffer a little.

Yes I've experienced this too. I used to get violently ill after dairy, then after my third pregnancy (not during - I remember a big mistake with cheesecake at a restaurant) I was suddenly able to have dairy with no consequences. And that was almost 20 years ago. I still would never dare to drink an entire glass of milk, but other things like soft cheese and ice cream seem to be OK now. I have no idea why.

It's always worth trying foods again, even if you had a bad first reaction. Sometimes it may be a particular combination that caused the ussue and not a single food alone. It would be a shame to abandon something as nutritionally valuable as milk if you are in fact able to drink it.

That sounds like a win. I have no idea why it should be, but just be grateful that it's one less intolerance for you to have.

Exposure therapy to intake in small quantities helps with intolerance and allergies

Ew, milk. I haven't drunk milk for years.

I have heard that some other dairies are also producing this milk.

Only one way to find out: try it more often and see if it doesn't return.

Some people lose the ability to digest lactose when they become adults.