This could be either a yeast/fungal infection
(which your doctor is suspecting and has prescribed anti-fungal medication
for) or even a simple infection like bacterial vaginosis
Both these infections usually come after sexual intercourse and are so assumed to be sexually transmittable infections.
According to you, you are experiencing much relief from the treatment. But you have experienced a reduction in the amount of discharge, which means we cannot rule out a response from the treatment.
But, if you really feel there is no improvement from the therapy then you could re-visit your doctor and consider initiation of antibiotic coverage as well. Testing yourself in the laboratory would ensure proper diagnosis and management of your infection. This will rapidly and effectively get rid of your infection.
Please visit your doctor and report your response and get advise on the way forward.
Hope this helps.