For stomach pain and issues, if you don't have Apple Cider Vinegar, you can just drink water 1/2 hour before eating prepares the body to pour on the acid that breaks down the food, and add a bit of salt to your diet and get similar results... Read the book Your body's many cries for water by Dr. Batmanghelidj.
For gallbladder issues and problems digesting fats, use betafood. For liver issues use coconut oil in your diet. Add magnesium to your diet for muscle health that affects digestion and elimination and add probiotics.
I don't often get stomach aches, but when I do, I take wormwood. It also treats and prevents nausea, so I'll take wormwood if I'm anticipating nausea as well (like from certain supplements). It is absolutely foul tasting, so if you plan on taking this for when you get sick, you might want to familiarize yourself with the taste first. That said, there really is nothing better for digestive issues.
You can take it as either a tea or a tincture. You can take the tincture by putting a dropperful in a small glass of water. For the tea, I use one teaspoon in one cup of hot water and steep for five minutes. When I have a stomach ache, I won't bother bringing the water to boil since I want to drink it as soon as possible.
I tried pretty much all of these remedies for a bad stomach ache but it wouldn't go away. I called a friend and she suggested the cat position on the floor. Which I did and in a couple of minutes my pain seemed to be gone even to the touch which was very severe before. I did cat & cow poses and couldn't feel the pain as before.
She also suggested I lie on my back and rub my stomach in a circle with my hand. I still can't believe it. That was yesterday, today my stomach is still all right. There was nothing ACV could not help me with, except this stomach episode. I'm still a believer in ACV and most of the solutions in Earth Clinic always work. I just had not seen this. Thank you anyway.