[@Aisling] I'm not trying to be rude. It's just a bit unfair to say, "Oh, I can't do low-concentration stuff because I'm a bit foggy today." What about those who take pain meds on a regular basis? If we used 'being a bit foggy' as an excuse, nobody would accept that either. We'd still have to do everything, and that's okay. 
If it's the pain itself that actually keeps us from doing things, it's different, of course. I wouldn't expect you to walk a mile or so. It's just that this 'being foggy' thing is something normal to us and still, we keep doing things...