Well, lets see.
First I had naught but a sore throat and a bit of a blocked nose. Not so bad but the throat was unusually sore, I don't normally notice them.
Within a few hours I had an invisible torniquet of steel tightening around my temples that made it feel as if my eyes would burst out of their sockets from the building pressure of that and whatever was brewing in the sinuses.
The initial symptoms have subsided a bit (throat is fine now), but I am left with a heavy cough, aching chest, still blocked nose and a headache that by normal standards is pretty heavy, although paracetamol seems to be keeping that under control.
Oh, and I've barely slept as a result of either blowing my nose all night or coughing my guts up the following night.