Many causes: All meds have side effects. Sorry you're feeling bad. Antibiotics sometimes cause 'upset stomach' like feeling bloated, having different bowel movements etc. Often lactobacillus is helpful (over the counter / yogurt type supplement). Pain killers depending on what you were on can cause ulcers- but you said no real pain. Any black tarry stool? Lightheadedness? Go see a doc for an examination.
Answered 9/25/2014
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