Correct!
The most likely diagnosis given the history and physical is a viral nasopharyngitis with a possible viral rhinosinusitis.
Now that you have established a likely diagnosis, it is appropriate to perform a quick screen to look for any complications of rhinosinusitis.
What are the complications of rhinosinusitis?
Not sure, remember that rhinosinusitis is an infection. A common complication of infection is spread of the infectious agent. Where could it go?