Colds leave you miserable, tired and achy. Kind of like regular illnesses do. Your nose is chapped; your sinuses throb; your throat aches; sometimes, you even have a headache. The only thing that sucks about a cold is that there's nothing to treat it. Maybe a little Zyrtec and Advil to help out but the Zyrtec doesn't really make it go away. It might diminish the cold but the cold will always come back to haunt you throughout the day. Unless it turns into a sinus infection, the only things that can really help are sleep and time.
Not to mention, that runny, cloggy feeling is a pain in the ass especially considering there aren't always tissues around. You have to do something about it, though, so you do. And then you start to dread tissues because your nose is so raw from them (but it's the only way).
Also, once a cold decides to stay, it stays. You might blow your nose but it'll only come back full force (or even more). So you have to fight it with tissues until it exhausts itself.
You can't even stay home, either, unless it's a really bad head cold. My cold doesn't qualify right now.