Got wiped out by foul bug this week. Went from feeling fine to temperature of 40 and terrible sweats in matter of hours. GP so worried came out to see me at 9pm and then went and got me large dose of penicillin. Then had district nurse doing blood tests. Seems I've had some acute infection - but while the fever has ended I still feel poleaxed. In particular, if I'm up and about for too long I feel really dizzy and nauseous. Any ideas as to why - it's really quite nasty and is going to ruin half term.