"It could indeed be smell related. I once recruited a lady who used to wear a perfume called Opium. Within minutes of her coming into the office, I would feel nauseous and get severe headaches. It got so bad that I had to mention it to her. She stopped wearing this particular perfume in the office and the situation resolved itself"
I bet it was a perfume called "Estee Lauder Youth-Dew" It always made me go dizzy and always made me sick. I went out with a very nice young lady who insisted on wearing the stuff, unlike you I didn't have the guts to ask her not to wear it so I had to end the relationship. It was dreadful stuff. If they had used that in wars instead of using gas they would have won the war but would not be vilified for killing thousands of troops and civilians. It still has the same effect on me today.