Only symptom is itching

Caitlin • Grad. Student. Avid foodie. Wine lover. Lucky. In Love.
My vag has been itching for the past week. It started after I started a zpak for sinus infection after thanksgiving, and having sex this past weekend made it worse (it seemed his semen makes me burn sometimes, and more so this time). 
Idk if it is a yeast infection, since itchiness is ONLY symptom I have--no discharge, smell, or pain. But I took a leftover diflican I had and have been applying topical nyastin from my gyno. No relief yet. :/ 
Does it sound like a yeast infection? I have been trying to think of different things I've been doing that could be a factor, like using a different detergent, dryer sheets, and bubble baths... 
Any suggestions? 
Can anyone relate? 
Thanks!