That's really interesting... I didn't know other people had similar experiences with colds...
I get both the experiences that people have described above...
For the first week, it feels really nice and cosy to have a cold... I wrap myself up in my duvet, lie on the sofa, and give myself time out to totally relax and watch day-time TV with hot lemon drinks and cough medicines... It feels lovely to be cosy inside while everyone else is busy doing boring stuff outside... And it feels like I'm a normal person again, with just a cold to deal with... All my usual brain symptoms seem to disappear... Feeling 'normal' again is such a nice and rare experience to be savoured, that it's almost worth having a cold just for this feeling... All the usual ME feelings seem to disappear for a while. I really enjoy it.
But then after the first week, if often turns ugly, and I get a lingering horrible illness, with extra-fatigue, extra pain, extra brain fog and a lingering depression. All these extra symptoms can linger for a month. I really struggle with it, and it really gets me down. I really struggle to do even one productive thing each day for about a month.
I get colds really easily, so I've learnt to avoid touching door handles when I'm in town (I think this might help), and if I hear anyone coughing, sneezing or sniffing, then I hold my breath, drop everything and run!!! (But unfortunately this method of germ avoidance doesn't seem to work!)