What to do about nausea/sore throat caused by allergies?

Yesterday I felt slightly nauseous all day, to the point where I could probably have thrown up. Then last night my throat started feeling sore, where it was uncomfortable to swallow. Today my nose was stuffy, my throat was really scratchy and painful, and I continued feeling nauseous. Is this just seasonal allergies? Or should I take some medication aside from allergy relief? Thanks!