If you have been experiencing a sore throat and fatigue for an extended period of time, it is important to consider seeking medical attention if there is no improvement after 7 days or if your symptoms worsen. In the meantime, you can try taking over-the-counter pain relievers like acetaminophen and lozenges for throat pain. Nasal irrigation with saline solution may also help with any postnasal drip that could be causing your cough. It is also important to stay hydrated by drinking plenty of fluids. Remember to listen to your body and consult a healthcare professional if needed.