I have had the same thing happen to me about 4 or 5 times. I have never been officially diagnosed, but I think it is some form of vertigo. My mom has it, and I believe it's hereditary.
Mine always pops up when I have had a head cold. I see a chiropractor occasionally and when I start feeling like I am going to be getting dizzy, I take over the counter meds for motion sickness. They contain meclazine (sp?) and help a ton. I have noticed if I can keep my head straight without bending it, it helps control the dizziness.
Working w/ my chiropractor has helped a lot. The first episode I had I was in bed the whole day and every movement made me spin. I was to the point where when I got up out of bed, I almost fell over with dizziness. After I took the motion sickness meds it was better, but once I started working w/ the chiropractor, the episodes were not near as severe.
Good luck, I know how scary this can be and I wish your husband the best!