Sore throat, cough, fatigue, sinus pain 2 weeks ago. Feeling great now but still have slight cough and some yellow mucus in nose. Am I still infected?

Cough. the cough may indicate a mild viral bronchitis. Hydrate, try some plain mucinex (guaifenesin). For your nose try a saline spray three times a day.
Not likely. You most likely have some remnants of the sinus drainage from when you were ill. Stay hydrated and take lots of Vit C and Zinc to help your immune system. Look out for fever and worsening symptoms (cough; sinus pain; etc) as signs of regression of your sinus infection. Good luck.

Related Questions

Been sick for 1week started with a sore throat it went away now a cough & sinus been blowing out & spitting up dark yellow mucus should I go see a dr?

?sinusitis. With colored mucus and the duration of your symptoms, seek treatment for acute sinusitis-saline irrigations + decongestants +/- antibiotics is the usual regimen. Read more...
Green mucus. Hello, since you have been sick for one week and now it is changing, i would recommend seeing your doctor. You may need an antibiotic. Read more...