Hi! welcome to HCM! It can be dried mucus in throat fungus usually does not present like this .sinus can be related to it and headache.The sinuses are lined with a thin membrane that produces mucus, which is normally swept along by hair cells and drains through small openings into the nasal cavity. Sinusitis starts when this drainage system becomes blocked, usually from swelling due to inflammation caused by infection or allergy. Soon, your head hurts, you feel facial pressure or pain, and thick mucus clogs your nose. The symptoms may clear on their own, but often they persist or repeatedly return. Mucus is unpleasant, nasty, and sometimes stays with you for longer than expected. You should rather get rid of it than let it run its course. Drink plenty of liquids during the day. The right liquids can help loosen the mucus from the lining of the throat as the liquids pass down the esophagus. Try Gargle with warm water and salt.Inhale steam and avoid dry environments. hope this helps.take care!