Can you have a sinus infection without a stuffy, runny nose, cough or fever? basically the only symptom being head/ face/ eye pressure

Absolutely: Yes. Some people can even have sinusitis with no symptoms, when this is found incidentally on another exam. However, for most people, facial pain and pressure are the most common symptom. Nasal blocakge is also a common complaint. Green runny nose is often present, but not always. Cough and fever are usually not associated with sinus infection, unless there is a cold associated as well.

Yes it is possible: Yes, one can have symptoms of sinusitis without having cold like symptoms. I have treated patients for sinusitis after they have presented to me for periocular, forhead and sometimes even unusual complaints. I use ct-scan if I am suspecting sinusitis even if they have been treated for presumed inflammation. These patients may present with pressure around the eyes and even unusual headaches.