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It is very likely you have a Candidal infection, and this will not be cured by antibiotics; in fact it is caused by taking antibiotics. Whenever one takes antibiotics (ABX), not only does the ABX destroy the targeted bacteria it also destroys many other bacteria thus allowing the Candida to grow. Treatment involves using an anti-fungal, and avoiding ABX use unless absolutely necessary. There are anti-fungal rinses, but you will need a prescription to obtain it.
Your constipation is a sign that your intestinal tract (IT) is not working optimally. Everyone should be having 2-3 bowel movements a day. The lack of this can be due to a number of things: too little water, too litter vegetables in diet, too little fiber, too much caffeinated products (coffee, tea, soda, energy drinks). So I would recommend taking a close look at your dietary habits. The intestine has lots of good bacteria which help break down all the stuff we eat, since most people carry around 10-15 lbs of garbage in the intestines, most are not eliminating sufficiently to keep the IT working well.
You symptoms are related to an improperly working IT while the pro-biotics are a good start you have to look at your diet as discussed in the previous mentioned information. But your symptoms also may be due to insufficient exercise in your daily routine. You should be exercising 60+ minutes 5+ days a week. Exercise helps the bowel to function better.
So changing some habits will go a long way to clearing up the initial problem and your constipation.
Let me know if you have any further questions regarding this question as my goal is to make sure you are completely satisfied with your answer.