What Causes Clear Vaginal Discharge Along With Severe Itching?

I have had 2 gynecologist visits for a problem I ve had for at least 4 months now. This is the info I have gathered. My ph is very alkaline I have a lot of clear discharge that soaks my underwear by the end of the day. The outside is itchy at night and I came back negative for stds and they did a bd affirm test for yeast bv and trich and everything came back negative. Now they want me to see a specialist. I don t have health insurance and this is getting expensive. Please help. I was also on metronidazole for a week with no improvement