Have Had A Bad Cold Since For 2 Weeks .

Have had a bad cold since for 2 weeks . Started off with plugged sinuses then this week sore throat to the right with a constant cough dry and loose and just feeling terrible for 5 straight days . I started using the netipod yesterday and cough became better .. Feels like sore throat on a gland when I swallow.., but when I cough it goes away for a second like something moves it .. Today my nose when blowing on left nostil , came this yellow green liquid , no smell but lots if it .. Now hardly anything coming out . Still feel not normal !! Had a sick stomache off and on but think it has been infection draining from my sinuses? Do I need antibiotics !!!
Thank you so much !!!