As a man who had 4 gallbladder attacks before he quit futzing around trying to “heal” it and then had the damn thing removed, I can say this is absolutely true. If your gut is not happy you are not happy.
When I was a teen I use to have the worst stomach aches you can imagine, so bad that I would have to go to the hospital over and over and once even stopped at a police station. I know exactly what you mean, it feels like death and I use to wish I would die just to stop the pain. The doctors had no idea what it was and to this day I have no idea, it just got less frequent until it went away, that was a nightmare. I use to lay on my side for hours until it stopped.
Going through this right now... Doc says I have a sludgy Gallbladder with hundreds of tiny stones in it. Fatty liver too. Going on the Mediterranean diet next week. Good thing I like that type of food.
I think that's the second corollary to "the path to a man's heart is through his stomach".