Brief Answer:
Upper respiratory infection likely.

Detailed Answer:
Hello,
Thanks for posting your query.
I have gone through your query and understand your health concerns.
The runny nose, sneezing and congestion are indicative of upper respiratory tract infection.
In this changing season the cause is most likely viral so treatment with antibiotics is not needed but you should do saline gargles. To make a good warm saline preparation you should add 5 grams table salt to 250 ml of water and make it XXXXXXX warm.
Then do gargles after every meal or after you eat anything during day time.
Cover yourself with sufficient warm clothes all the time and avoid open cold air exposure as this could aggravate the problem.
You can also take low doses of decongestant medicines like half tablet of Sinarest as required for congestion.
Keep well hydrated with plenty of warm fluids and especially fruit juices.

For running nose you may apply 2 drops of saline nasal drops to each nostril twice a day for relief.

Eat plenty of fresh fruits and green leafy vegetables. Eat high protein diet like cereals, pulses, chicken, lean meat, eggs.

In case there is sputum production with cough, considerable pain in the throat, high grade fever or the symptoms persist for more than 3 days then do consult your physician for a local physical examination of your throat to rule out any bacterial infection. Antibiotic treatment may be needed in such a case.

I hope this answers your query.
In case you have additional questions or doubts, you can forward them to me, and I shall be glad to help you out.
For future query, you can directly approach me through my profile URL http://bit.ly/Dr-Rakhi-Tayal
Wishing you good health.
Regards.
Dr. Rakhi Tayal

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