what can i buy OTC for a yeast infection

i canceled my doctors appointment for the 12th because i didnt need to check in and i didnt want to pay a copay and have nothing to report to my primary care doc. its impossible to reach the office so im out of there until november. a couple days ago itching began and i was peeing a lot. i thought the peeing was from pregnancy until last night it burned. so what can i buy at the store tonight to help or treat this? im about positive its a yeast infection now