They are probably condyloma. You need to see a gynecologist, because there is treatment for them.
Another term for them is genital warts.
If your doctor isn't giving you proper answers, its time to see another doctor.
While I'm not an OBGYN I can honestly say that I've never heard of white hard bumps being associated with yeast infections. Since you are prone to getting them so often, I would go get a second opinion since your current doctor sees no problem when obviously there might be one.