Are they calcium based antacids? Calcium is constipating and may reduce diarrhea in some IBSers.The retching is not common in IBSers but some IBSer have it.The main symptoms.1. Pain or discomfort that is reduced after a bowel movement.2. Pain or discomfort that is associated with altered stool frequency3. Pain or discomfort that is associated with altered stool frequency.Most cancers do alter your blood work up in some way. Colon cancer is usually symptom-less until the very end so usually IBS symptoms are not cancer.Usually the treatments for discomfort are antispamdodics or antidepressants (they change how pain nerves transmit pain). The other treatments are also at the how your brain interacts wtih pain like Cog. Behav. Therapy and hypnotherapy. Basically you tell the nerves going nuts when they shouldn't to knock it off with your mind rather than with drugs.K.