If you have a sore or swollen throat (strep throat) then antibiotics will help
But pneumonia can also be caused by viruses and antibiotics do nothing at all in that case.
Black Elderberry (Sambica nigra) helps and may be in your pharmacy. White willow (Salix alba) twigs and bark can be taken. A mushroom call Chaga should help and if you are adventurous and have tree fungus growing nearby and there are droplets oozing from the shelf part (or even dried droplets) then lick that off of them.
People need to learn the difference between viral diseases (cold and flu symptoms) and bacterial infections.
Antibiotics do not stop or slow viral diseases.
And if you have nagging headaches and dizziness look for a Cold and Flu preparation containing Dextromorphan. Several brands include this and it reduces brain inflammation.