Hi i am always getting bv, this last time metronadizole did not control it. will azithromycin control it?

Probably not: Azithromycin hasn't been researched in BV, except a single study showing that metronidazole plus AZM was no more effective than MTZ alone. The usual back-up drug when MTZ doesn't work is clindamycin. Boric acid vaginal capsules may help sometimes. Resistant BV is difficult; don't try to figure this out yourself. See your doc, or ask for referral to a gyn who subspecializes in infectious diseases.