Facial pain, fever up to 103 (fever has stopped), yellow watery nasal discharge, cough, greenish brown sputum. sinus infection and/or bronchitis?

Infection.: Fever, facial pain, cough... These all point to infection. Whether the source is sinus or lungs, it's hard to say here on an online forum. Regardless our advice remains the same-- see your doctor for an evaluation, and to see if antibiotics might be needed. Go to urgent care if you don't have a doctor.

Possibly: Or you may be getting over a cold. As a cold improves the nasal secretions get thicker and a little yellow. If you are coughing up thick brown sputum with a deep cough i would be more concerned about a bacterial pneumonia or possibly bronchitis. Most bronchitis is viral and happens as the last part of a cold .If not improving see your doctor.