Vaginosis?

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Went to the doctor and she diagnosed me with this. She wrote a prescription for flagyl antibiotic pills and I finished them without an issue. Woke up today and my vagina is itchy and sore with burning. I had sex and it hurt at first and then it was fine, afterwards I felt swollen and my vagina is burning and itchy. And it burned to pee. What is going on?! Have you had this? I'll for sure go back to the doctor but until then...