I have struggled with BV since my first period. I couldn't stand it any longer. My old dr. prescribed so many different remedies, I was beginning to feel like every prescription had me as the exception clause to it working. Fast forward to a few years ago... I had to find a new doctor since my insurance was no longer taken by my old m.d. My new doctor had struggled with the same thing and told me that her OBGYN had prescribed boric acid suppositories to great success with Vitamin C (oral) supplementation. I was skeptical. Acid in my vagina? But I was so desperate to finally rid myself of this nightmare.
So I got medical grade boric acid at the pharmacy and 00 empty pills. The pharmacist was kind enough to show me how to fill them. I went home and filled a bunch (It's actually kind of fun). I inserted one, took some Vitamin C to "bowel tolerance" and a few hours later, I turned to my husband and said, "You know, I think this is working" No more itchiness. No more stinkiness.
So I'm a few years cured. I only use the suppositories if I feel a bout coming on. (Like when I was in a hot tub that I realize now was dubiously clean).
You should absolutely wear a panty-liner - there will be a clear discharge from the boric acid melting in addition to your own discharge.
This works very well for yeast infections as well, btw. A pregnant friend of mine was suffering from a raging yeast infection. I mentioned to her boric acid suppositories and after she checked with her doctor that it was safe for use in pregnancy (it is), I gave her some of my prepared boric acid pills. She didn't use the Vitamin C in conjunction with the boric acid, and it still cleared up.