My wife had vomiting and diarrhea, but i only have nausea and seem to be constipated. could this be a symptom of being dehydrated?

Dehydration: Yes, constipation is a sign of dehydration. Even if you are not vomiting, you are probably eating less due to nausea, and that can cause mild dehydration. You can survive without food much longer than you can survive without water, so it is very important to drink first, before you eat anything. Intolerance of fluids and food can rapidly cause severe dehydration, so monitor intake carefully.