Yes, I met with a dietician that specifically works with oncology patients at Mayo. I was also diagnosed with gastritis after an endoscope at Mayo. My oncologist knows of my issues but still thinks Letrozole is the best. When I get really bad I take a Letrozole vacation...not taking any for 2 weeks. I feel 100% better. Once I started back up taking just a half dose and was fine. Issues recur when I go back to taking full dose. Keep trying to do what doctor says I should be doing though.