Hi.. Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand your concerns.. As per your complain it seems that you have an upper respiratory tract infection leading to cough, cold, congestion and sore throat.. Hoarse voice also known as Laryngitis is also due to inflammation of vocal cords secondary to infection.. Dry mouth can be de to dehydration as well as mouth breathing that occurs spontaneously when nose is stuffed.. Nothing to worry, you can start taking anti allergics like Levocetrizine, decongestants like Phenylephrine, mucolytics like Ambroxol, cough suppressants containing Dextromethorphan and expectorant like Geifenesin. Take anti-inflammatory painkiller like Ibuprofen.. You should do warm saline gargles, steam inhalations and use a humidifier in your room.. You should sip plenty of warm water.. Chew Vitamin C pellets. Avoid spicy and chilled foods Hope this information helps.. Thanks and regards. Dr.Honey Nandwani Arora.