Welcome in H.C.M.
I have gone through your query regarding your chain of symptoms as sore throat
, headache, nasal congestion
followed by fullness in ear, pain and pooping in ear.
your symptoms are in favour of upper respiratory tract
infection which has reached to ear via Eustachian tube ( tubular connection between ear and throat ) thus giving feeling of fullness in ear and later on discharge.
As for as treatment is concern you should take broad spectrum antibiotic, anti inflammatory, anti histaminic, and nasal decongestant drops. Don't use any ear drop
I hope above treatment will help you, failing which you please contact E.N.T. specialist for thorough examination to reach to correct diagnosis and treatment.