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Gastrointestinal symptoms (cramps, diarrhea) are a common side effect of strong antibiotics like Augmentin. It usually ends in 2-3 days. It is because the antibiotic kills off some of your healthy gut bacteria along with the sinus bacteria. If you have a lot of mucus in your diarrhea, blood, or your fever gets above 102 degrees, you will need to see your doctor again to make sure you haven't developed a GI infection like C. diff.
Meanwhile, you can try bland foods like toast, rice, boiled potato, applesauce and yogurt if you like it. There are over the counter probiotic supplements that you can buy as well, is you have someone you can send to the store for them.
Please let me know if you have more questions about this.