Hi. I received the flu vaccine last Monday. I became sick with loss of appetite, chilled to the bone, body aches in my back and shoulders, headache, tired and a fever (in the evening) on Wednesday. At 3am Thursday morning I vomited once and had diarrhea the remainder of the day. Friday I felt much better with no fever but became aware of a slight cough that became worse Saturday and Sunday. Now, it's Wednesday, and the cough is much worse and has given me a sore throat and mucus that feels stuck in my chest with a mild runny nose. My chest feels heavy at times, but I am currently able to breathe fine....but I feel the urge to cough constantly. Is this the flu? Did I have the flu possibly before the shot without knowing it? Will this get better any time soon or do I need to make a doctors appointment?