Had the flu 14 days ago, went to the lung dr. Had a lung x-ray, dr. Said my lungs look healthy, but I still cough allot of mucus (ps: have sinusitis).

Sinusitis. Upper respiratory infections, including sinusitis, may produce large amounts of inflammatory secretions resulting in sputum production and post-nasal drip. Try using saline rinses with a neti-pot, steroid nasal spray and a decongestant (pseudoephedrine, oxymetozaline, etc.). Check with your pharmacist for otc products. They will be happy to help. Good luck.