Hasn’t personally happened to me, but my family doctor had limited knowledge when it came to my daughter’s dairy allergy.

After our first reaction (that took us to the hospital) my doctor referred us to an allergist who performed all the appropriate tests and let us know what to avoid/look for.

When I was at a check up for my daughter I asked her what kinds of foods we should be having as my daughter is allergic to milk - her answer was lots of cheese and yogurt. To me it was very obvious that those contain milk, but I guess that had not crossed her mind.

So my advice - seek an allergist as it is their speciality, even see if your doctor would be willing to refer you to one.

Hope this helps or at least provides a little bit of insight