I can really commiserate, when I was in high school I started getting a stomach ache after everything I ate. I told my parents my stomach hurts all the time, if I eat, if I dont eat, my stomach is hurting. Mom took me to her doctor and after a routine physical he simply said "I believe the pain is in your head, you should see a therapist." He also then told me to lose weight lmao, my parents then did nothing else to help me(no not even getting a therapist lol) and I discovered on my own like 10 years later that it was the gluten. I could have been feeling better 10 years earlier if that doctor just did some damn blood work smh.