Is this JUST a sinus infection?

Yesterday I started coming down with what seemed to just be a sinus infection. Im congested and its hard to breathe. But I also am having a sore throat. Its not a regular sore throat though. It feels very dry. Kinda of like when you are really really thirsty, but when I take a drink of water, the feeling does not go away and it it kind of sore to swallow. Could this be from my sinuses or is this something completely different?