Stop douching. Stop constantly washing. Stop rinsing with vinegar!
It's messing everything up. Your vagina is self cleaning and NEEDS to have its own balance. There are necessary bacteria that need to be there to stop the yeast from taking over. Antibiotics and constant cleaning kills that bacteria and then the yeast takes over.
Get some yeast infection medication (just the normal over the counter stuff) and take that. At the same time, stop everything other than a simple wash in the shower as you would wash any other body part. Make sure you are dry afterwards and wear cotton panties with loose fitting clothing for awhile.
Don't douche unless you have to and certainly not every day; it’s so bad for your vagina. I agree with MOHSO, you need a new doctor!