What might cause a yellow cottage cheese-like vaginal discharge, and burning during urination?

Probable yeast infec: It sounds like you probably have a vaginal infection. Usually yeast willgive a thick white discharge. You can use over-the-counter medication to treat but you should see your dr. For a proper diagnosis if it doesn't resolve with over-the-counter treatment for yeast infection.

Yeast: An infection ,as you described, is probably caused by a vaginal yeast infection and can be treated with Monistat which is over the counter