If its not candida overgrowth then what is it?

I have had vaginal discomfort after eating carbs or Sugar for years. I thought candida overgrowth was the cause based on my own research but I was wrong.
I just had a stool and blood test and everything came back normal. If I do not have candida overgrowth then what else could be causing this vaginal discomfort?
The vaginal discomfort is the only symptom I have and it only happens after eating foods high in processed Sugar like cookies or junk food or anything made from white flour like pasta,white bread or torillas.

I stay away from foods like that for the most part but do like to have them from time to time.I can eat those foods for a few days in a row and be ok but the discomfort gradually builds in intensity day after day to the point I have to cut those things out and return to my normal boring diet of veggies and salads. Cheese does not bother me, its only stuff made with white flour and sugar.
Any ideas what this could be? I googled SIBO and it did not sound like what I have so im very confused. Tweet