Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern..
As per your complain persistent sore throat
along with yellow mucous can be due to number of causes like chronic upper respiratory tract
infection, sinusitis, post nasal drip
I would suggest you to consult an Otolaryngologist or a Pulmonologist and get evaluated and a thorough clinical evaluation and investigations like sputum culture
, throat swab culture, chest x ray and blood tests can help in diagnosis and treatment will depend upon the cause..
You can be advised a course of antibiotics, anti-inflamamtory painkiller, decongestants, mucolytics, warm saline gargles, steam inhalations and use a humidifier in your room..
Chew Vitamin C pellets and suck throat lozenges..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora..