My husband sneezed a few hours ago and got very dizzy, like felt like he was going to pass out. He has been laying down since...the lightheaded- ness was dissipating. He just sneezed again and got dizzy again, although not quite as bad as the first time. What could be causing this?
It can be due to allergy.  But he is required to be checked. Blood mammogram is to be done. All examination to look for respiratory obstructive disease.