Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern..
As per your complain the symptoms of scratchy throat, non-productive cough, loss of voice and
nasal congestion seems to be due to allergies to some known or unknown allergen..
While the other cause can be
throat infection but chances of allergies seems more potent as per the symptoms..
I would suggest you to take anti allergics like
Benadryl or levocetrizine, take cough suppressants containing
Dextromethorphan, do steam inhalations and warm saline gargles..
You can also use a humidifier in your room to relieve dryness..
Sucking throat lozenges can also help..
For nasal congestion you can use decongestant nasal sprays containing
Xylometazoline [ otrivin].
Limit exposure to dust and pollution, pollen, animal danders..
In case if you do not find relief in a week consult an Otolaryngologist or an allergist and get evaluated..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora..