Feeling awful!!! been going on for 2 days now! help please!!?

hi....2 days ago i recently started having a bad cough...it would get progressively worse and worse...and it got to the point where i would gag of coughing so harsh...it would allow me to spit up some gunk that was either gray or dark brown. i then started feeling symptoms of the flu(head aches, hot flushes, sweaty, etc....nasals got extremely congested...i cant stop spewing mucus everywhere...the color is yellow...this is horrible...i cant sleep or do ****...and i have a damn date by wedensday!! what can i do to get well fast!!!!.. i cant breathe more than halfway without having the need to cough