I think if you are experiencing that much discomfort from digestion, I would look for the cause rather than treating the symptoms.
Not digesting your food properly or completely is going to affect your ability to grow muscle.
I would look at my diet and experiment a bit with it, for example for one or two weeks, eliminate one thing, like dairy for example, and see how I feel.
Other culprits of dogdy digestion are wheat and soya.
One of the other simple solutions to bad digestion is to slow down when eating and chewing your food A LOT.
I have avoided ant-acids like the plague, I have rarely had any digestions problems, on the few rare occasions that I have had issues, I have taken:
-fennel or peppermint tablets or tea
-activated charcoal
-herbal bitters
-digestive enzymes
-pro-biotics (with psyllium husks)
I have also been looking into the benefits of colonic irrigation if digestion has been impaired, it is a contraverial treatment, although quite a few alternative medical practitioners recommend these.