This is uncommon. Headaches, body aches, fever Rest in a peaceful environment. Try relaxation exercises. Drink fluids for fever. If you are on other medications, make sure there are no adverse interactions.
Some medications come in combination with decongestants.
Sore throat, hoarseness Rest vocal cords. Humidify with a vaporizer. Drink lots of fluids. Gargle with salt water. Use throat lozenges.