Hi Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern...
Sore throat & running nose are commonly due to viral fever. Running nose is due to
viral rhinitis & headache is due to associated sinusitis. You should do following remedies
1.Saltwater gargle- gargling several times a day with warm salt water can reduce swelling in the throat and loosen mucus, helping to flush out irritants or bacteria. Dissolve half a teaspoon of salt in one cup of water. Just remember to spit the water out after gargling, rather than swallowing.
2.Steam Inhalation should be done. It would clear your sinuses.
3.You can take
acetaminophen or
paracetamol,it helps to reduce swelling and pain.
4.Sucking on cough drops stimulates saliva production, which can help keep your throat moist
5.Take a
liquid diet & take rest. You would start improving with time
If problem persist visit a ENT specialist
Hope this helps