yeast infection or something else?

Hello, I have had white, clumpy discharge for about 3 months, itching and what I would say can be described as a yeasty smell. I took some yeast infection medications and, although the symptoms did improve, the infection never fully cleared up. I did the tests for yeast infection and it turned out negative. What else could it be? Is there any chance of it being herpes?

you could have trich or BV. which require different medication. they are very common and have the same symptoms as a yeast infection.