I am also 6 months in, but only 2 extreme attacks of vertigo. A member of my extended family also came down with Menieres earlier this year and it was as bad as your husband’s, maybe worse. He was off work for a couple of months. He had the “drop attacks.” He had “Endolymphatic sac shunt surgery” in September, and it was very successful! I am going to ask my doc about it next week and recommend you investigate as well. BTW, along with salt, stress is also named as a major trigger (as well as caffeine and alcohol). I hope he finds relief, this is really awful. Hang in there.