Brief Answer:
Oral antihistamine, stream inhalation, xylometazoline spray, lozenges

Detailed Answer:
Hi
Welcome.
I have gone through your query.
You might be having upper respiratory tract infection. Most of the time it is viral in nature and is self limiting. But it need to be confirmed, for that clinical examination is required and chest X ray. It would also be worthwhile to get your nose and sinus examined by a doctor.

In the interim I would recommend you
1. Drink plenty of water, especially warm, drink at regular intervals.
2. Steam inhalation with few drops of eucalyptus oil 3 to four times a day.
3. Instead of saline nasal spray, use decongestant Nasal spray like xylometazoline.
4. Wash your face with warm water in night before going to bed and gently blow your nose.
5. Take over the counter oral antihistamine like ceterizine.
6. Drinking warm lemon water with honey may also help soothe a sore throat. You can also try lozenges like strepsils and cofsils which will also be helpful.

Try this measures you should be fine.

This provisional advice provided by me is based entirely on the input provided to me. I would suggest examination by the doctor.

Hope this helps.
Take care

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