Please help don’t know what Mom is sick with

Well… she has a terrible cough which sometimes results in her coughing up phlegm (no blood though), very very achy body esp. bones and neck, neck hurts when she coughs, weariness, tires easily, had these symptoms on and off since February but they started getting really bad on Sunday (6/17). It’s like the flu on steroids. Any idea what this could be?? I really need to know before I leave (this Saturday).