Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand..
As per your complain dry mouth and snoring seems to be due to mouth breathing
as there seems congestion in nose..snoring..
Due to restriction in nasal breathing
there is spontaneous mouth breathing leading to dryness in mouth and
Congestion in nose seems to be due to sinus infection
I would suggest you to consult an Otolaryngologist and get evaluated and a thorough clinical evaluation and invstigations like Nasl Endoscopy or MRI of sinuses can help in diagnosis and treatment can be planned accordingly..
As of now you can do steam inhalations, saline nasal sprays, decongestants like Phenylephrine
for relief from congestion..
Stay away from chilled foods..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.