usually they only lat 7-10 days though bv can further complicate it all

you can still use metrogel to treat bv during your period. You also shouldn't use tampons when you have bv - it traps the bacteria up there and allows it to keep growing better. you also can use oral flagyl to treat bv but I understand there is a shortage of it at the moment
It's a pain in the butt I know but anytime you think you have vaginitis related discharge, best to be seen. discharge related to herpes is usually clear and since you have hsv1 genitally, in general, recurrences will be few so it is worth going to be seen and tested.
I'm a fan of fem dophilus by jarrow. It's a probiotic that has been shown to colonize the 'good' bacteria in us gals urogenital tract to help ward off vaginitis and uti's. You store it in your fridge if you try it. There's a good article about it by dr Gregor Reid on their website too. I take it 2x/day when I feel like vaginitis might be starting again and then 1/day until I've broken the cycle and haven't had any vaginitis in awhile. It really helped me get rid of a non-stop bv infection that wouldn't stop. Might be worth looking into as something to try to ward off bacteria in between treating known bv infections.
best of luck!
betsy