Symptoms and Sufferings

There are strange things that happen to my body when I have a bad cold, and I'm wondering whether it's just me, or does everyone get affected this way?
For example - I constantly feel like I need to sniff, or blow my nose, even if there is nothing in my nostrils. It's like there's some kind of irritant permanently lodged in my snout and it's like having a very thin feather constantly tickling the inside of my nose.
Also, my knees ache like I've been running a marathon on uneven ground in high heels.
And my brain seems incapable of connecting neurons at the speed it does on a normal day, under normal physical circumstances. A task that might have taken thirty seconds and involve very little thought seems to require a monumental Herculean effort just to get started.
My eyes hurt too. The backs of them, where I'm guessing the orb of the eye meets the optic nerve. Why does that happen? What possible help is that to a body wracked with the woes of an upper respiratory tract infection?
It feels like the whole inside of my head has been rearranged and clogged up with some kind of jelly.
This is not fun.

RC 15-4-25