Ob-Gyn questions? Ask a gynecologist online.
Have you changed soap or hair product? Partners? Your workout routine? Has your partner changed soap or skin care products?
Most likely you have not been adequately treated for BV. A good treatment is Diflucan two pills 48 hours apart and a week of metronidazole vaginal or oral. This should be repeated monthly for 3-6 months.
Bv does not cause fever. If it is resistant. That's how it's treated, as I noted above.
Yes possibly. Though I have no idea what tests were done