Stay away from anti-acids at all costs, they make it temporarily better, and when the effect wears out, the acidity becomes so much worse, and you start needing more. You will eventually cause stomach ulcers. Keep orals at a minimum, they are harsh on the digestive tract. Buy Vegegreens supplements and take it 2-3 times per day, it helps regulate PH in your stomach. One serving of Vegegreens has 6-7 servings of vegetables, chug it with water and you're g2g. Don't take useless supplements in excess, or simply too many supplements, they will only worsen it. Stick to simple foods, easy to digest such as white fish, poultry, white rice, sweet potatoe, etc. Don't mess around with your diet eating worthless things. They will only ruin your progress and digestion. Milk helps regulate PH in the stomach as well, I don't use it because it causes acne for me, all dairy does in excess. Apple cider vinegar, before bed and when acidity spikes, mix it in a big cup of water and drink it, don't drink it alone, add water to it. Don't bing, you'll suffer. When you eat, let your food sit in your stomach before deciding to lie down because when you lie down, acidity leaks out. Give an hour before training when you eat your meal. Keep hydrating with water, stay away from sodas, they bloat you and have useless ingredients. Vegetables are your best friend on Trenbolone, pack on them as much as you can. Salads with apple cider vinegar for example. Citrus fruits can worsen your acidity, depending on what your acidity is caused from. You can become acidic from not having enough acid in your stomach (happens from abusing anti-acids) or simply having too much.
It's always a matter of what you put in your stomach while on Trenbolone. When such happens, the best thing to do, is to take a step back, and look at what you are doing wrong in your diet or what you could do to fix your issue. I would never try to resolve digestive issues with medication. Cutting out your carbohydrates, and eating moderate amount of healthy fats for a bit to get your acidity in control can be an extremely beneficial approach from past experience. Your stomach might need a break, since you might be overdoing something. Giving it a break, doing a detox and starting fresh could fix your issue.
That's from the top of my head, hope this helps.