Good luck to you. I saw a lot of doctors and was determined to have lots different things wrong before I finally connected the dots MYSELF and got the right test done.
Pernicious anemia was my first diagnosis. Seven years later, I was diagnosed with lactose intolerance. Three hours of my own research later, I was tested for celiac disease. DING, DING, DING! I was sick for over a decade and saw a number of specialists, and had oodles of tests, and buckets of blood drawn.
Doctors failed me.
Good luck. I hope you have a different experience and can get well.