What sickness is this?

It is not the flu... you have a nasal infection and post- nasal drip. If the mucus coming out of your nose is green it means you are sick and just do not have a runny nose. Mild anti-biotics/mucinex will help relieve your symptoms. Sudafed or tylenol will clear up your symptoms temporarily. If you have a lot of trouble sleeping/ breathing go to your doctor. Otherwise get some sleep and it will p.