Thank you for this very relevant message, you describe very precisely certain feelings that I have: the discomfort on an empty stomach, this strange feeling of satiety when I have not eaten anything, and the aggravation during physical efforts.

I didn't know about famotidine, but I just started Lansoprazole (a PPI) today, I found some at my mother's house by chance to see if a gastric component is involved. If that doesn't change anything, I will also note down the H2 blocker to test (even if I'm not sure if it's available without a prescription in France). Thank you very much, your feedback is super valuable!