Severe stomach pain, tums (calcium carbonate) helped, what is it?

Lots of things...: Our brain can't tell the difference in pain signals from heart, esophagus, stomach, duodenum, liver, pancreas, bile ducts, liver, or gallbladder. So illnesses of any of those organs causes upper abdominal pain; gallbladder is most common. Since Tums (calcium carbonate) help, it may be excess acid ; and ulcer (but not for sure). See dr. ; get proper diagnosis; good luck!