I ate some questionable food. My stomach hurts now. What could it be? Would Tums (calcium carbonate) help?

Stomach indigestion. You may have indigestion or acid reflux or a food allergy or early food poising symptoms from what you ate. You can always try tums, zantac, (ranitidine) Prilosec or any other over the counter acid reflux medications which could be helpful. If you notice this recurring with a pattern you should talk to your doctor.