It can be all from the yeast- even the UTI (most commonly a UTI isn't caused by yeast, but rather bacteria- some UTI's can be caused by yeast). Being on that many antibiotics also increases your chances of yeast issues. Make sure you keep everything clean- only use a towel once, wash all clothing, wash your hands alot and use paper towels to dry them. Stay away from sugar and carbs (even sugar in fruit) and that should help, along with treating the yeast. You can get medication from the doctor for treatment- or there are a few other options that are over the counter, but discuss which is best with your doctor.