Finished bactrim (sulfamethoxazole and trimethoprim) and flagyl. now i am experiencing vaginal burning and white, pasty discharge. could it be a yeast infection with no itching?

Yes, possible yeast: Antibiotics like Bactrim (sulfamethoxazole and trimethoprim) and Flagyl can trigger yeast infections. Yeast infections often don't itch, and your other symptoms sound typical for a vaginal yeast infection. Return to the doctor or clinic where those antibiotics were prescribed. Or if you want to try an over-the-counter yeast medication like miconazole, see your doctor if your symptoms don't clear up right away. Good luck!