Morning sickness...all day

So on the voyage to our little child, April has been experiancing extreme morning sickness. But we are wondering why they call it morning sickness, because it last all day long! The mornings have started off as lying in bed, fine, then a little dizzy, then to nausea, then feeling as she describes as extremly hung over all day long. I really feel for her. We thought at first it was the Pre-natal vitamins, but the doctor gave her better ones that only help, well a little, wow, how this stinks for her, but I am sure, it will all be worth it in the end!