Hi there. So, to treat for strep they have to swab your throat. You must have had strep present on the swab which means that really was the issue. And strep can be a little resistant. Augmentin does usually knock it out though. I took antibiotics for a full month around the clock for a tooth issue (yes, 4 times a day and got up at night or it). I was fine during. About two weeks after stopping, all heck broke loose in my GI track. I did get a yeast infection and treated that. BUT, I had a day in which I was horribly ill. I had stomach cramping, nausea and diarrhea. It was brutal. After that day, I was left with unrelenting diarrhea. I thought I had C diff. I didn't but did have a GI tract stripped of normal flora. At that time, I used a prebiotic tea called kambucho which tastes really good (cold from frig section of super market) and also ate things like sauerkraut, pickles, etc. Things like apple cider vinegar, etc. That gets your gut ready for the next thing which is probiotic. I took a probiotic pill and ate probiotic yogurt. It helped doing this for about 2 straight weeks. I'm on antibiotics again for an infection and I'm eating yogurt and taking the probiotic.