Our expert says:
I can't imagine what may be wrong with him. But if he is taking time off work claiming to be sick, can't he be asked for a doctor's note explaining what's wrong ? And if he is having odd "turns" while at work, then it is surely appropriate for his supervisor, or someone like that, to ask for a doctor's note, to clarify what is wrong, and what might go wrong and how you should try to help him in that event.
I can't off-hand think of a medicine that makes you feel nauseous when you DON'T take it. But its all too unclear - maybe he had a crisis at home, and is just saying he is nauseous ; there are so many possibilities.
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