Dry thick discharge

So for over a year now my discharge has been dry and crumbly. I’m not able to wet anymore, because my discharge stays white, crumbly, and dry. I’ve gone to three gynecologist they always test me for yeast, BV, and STI’s it’s come back negative each time, but still I’m having this dry crumbly discharge that mimics a yeast infection. Does anyone know what it could be? Gyno’s have been useless. I’ve tried Boric Acid, Maca Root, Replens, and even birth control which is also didn’t work. This feels hopeless I use to have a healthy vagina with healthy discharge and now suddenly this has been going on for a year.