Excessive l discharge. Dr.s don't know what's going on.?

I have a thick white discharge that has gotten worse over the past year, Was diagnosed with BV and yeast a year and a half ago and took pills to clear it up. Had tests that showed excessive white blood cells 2 years ago. I have been to the Dr. so many times in the past 2 years and every time they look they are like oh yeah somethings going on. Then ALL test results come back negative. I have been tested for ALL STDs several times over (seems all they want to do is test for STDs) I've only been with 2 guys in 12 years so I know that's not it anyway. Been tested for BV and Trich, syphilis AIDS you name it. And all cultures come back normal, but this isn't normal! I had one Dr. who just started guessing and gave me like 5 prescription over 4 months to treat various infections that didn't show up on tests, but she didn't know what else to try. I decided to go to a different Dr. and she doesn't know either so she said it could be a cervical infection and gave me a different antibiotic and that didn't work either. I still owe like $1,200 in medical bills that I am paying off and IDK what to do! I know if I go back they will just test me for STDs and infections and do another culture that will show nothing and I will be another $300 in debt.