Based on the information provided it seems like you are having flu
along with sinus issue called " SINUSITIS".
Sinusitis have different cause like it can be due to
2) some infection of sinuses
3) autoimmune disorders
Mostly the headache and pressure your are facing is commonly seen in infective type of sinusitis hence you will also have post nasal dripping and fever
, with pain on touch around the forehead and side of nose area.
CONSULT physician, he will prescribe the antibiotic to make it go away sooner , even thought it will go away on its own but will take longer time to come back to normal, more over their are chances of other complications.
Mean while inhaling steam therapy may help to open up sinuses and help to breath with ease.
Hope it helps.
Dr. JAY PATEL