So, what can you do when you have a yeast infection? First of all, stop eating sweets and carbohydrates which feed the yeast. Remember to only wear cotton underwear, and if possible, wear looser clothing (tight pants and yeast infections don’t go well together). And watch the video below for an easy way to kill that infections. all it takes is 30 drops of rosemary essential oil and 1 oz of a carrier oil, such as grape seed oil.