I spoke with a friend, who is also an emergency room nurse once about yeast infection treatment and she said don't buy the 1 day or the 3 day treatments. If you try to take care if it on your own, without going to the doctor, buy the 7 day stuff. Just a suggestion. Sounds like a yeast infection. Some are more obvious than others, but your description seems pretty clear. Take care.
Definitely sounds like a yeast infection. See your doctor or pharmacist for treatment.