am i allergic to gluten or milk or both?

for my entire life I’ve had stomach problems but just recently they’ve gotten worse. after every meal i would get stomach discomfort. then i went on a gluten free diet and i haven’t had any stomach problems but most of the gluten free stuff is milk free. i had a milky way today and now im having stomach discomfort again but i also had cupcake that were gluten free but had milk in them. i have had a stuffy nose and a cough fo the past month I’ve been do the doctor 3 times and she said it was allergies but i was looking on the internet at my symptoms and the cough and stuffy nose is a sigh of being allergic to milk.do you think i have a gluten issue or milk or both???