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You have recently caught a cold. Infections can lead to tiredness, headaches, and even fever as a result of a virus, such as the one that causes colds. To recover from your illness, you should mainly rest, drink a lot of fluids, and perhaps use some over-the-counter medications to ease your symptoms. 

You might have a viral infection. Fever, cough, cold, body pains, and neck swelling are fairly common with these infections. The virus is being fought by your body, which is manifesting these symptoms. Resting, staying hydrated, and taking over-the-counter medications for fever and pain are helpful in this case. If your symptoms get worse or last longer, you should visit a doctor.