Hello, I would be happy to help you with your question.
In the setting of recent antibiotics, you were definitely prone to a yeast infection, but the pattern of distribution of the areas of itching and your description does not completely fit with a yeast infection. While the itchiness is typical, something is not quite right with regard to calling this a yeast infection. This is especially the case given the complete lack of response to medication. This should definitely be checked out by an OB/GYN to make sure that it is not some type of STD
or other type of infection. In the meantime, until you can be seen, use of hydrocortisone cream
might help for the itching.
I hope that this helps and good luck!