A lot of times after a nasty cold or flu some symptoms, especially cough, can last up to 2-4 weeks longer. A fever, body aches, and other symptoms shouldn't continue. It could possibly be allergies. Stress, like from planning a wedding, can really impact your immune system and cause you to get sick and have difficulty fighting it off. I would see a doctor, for the fact that a fever for 4 weeks is really not good.