Intolerance to cigarette odor

Hi all,
I'm very sensitive to cigarettes. It doesn't even have to be the actual smoke itself.
Being in proximity to a person whose breath and clothes reek of cigarettes affects
me badly.
I attend an adult school, and recently a guy joined the class and absolutely stinks of
the stale cigarettes. He obviously smokes heavily at home, then comes to the school
in the same clothes.
Then the door of the room is closed, no fresh air, and the heat is blowing. I had to leave
after two hours and go home.
The next day, I was sick as a dog. Heavy pounding head, nausea, loss of appetite/thirst.
Not wanting to move except stay on the sofa. Something like a cross between flu symptoms
and a hang over.
I've always had this issue, but thank goodness, I've managed to avoid the situation
as best I can - this is the third time in my life it has happened.

On the day I was ill, I managed to improve the situation somewhat by taking Gelsemium 6x.
At least after that I could function again.

Can anybody tell me if any other remedies might help in this acute circumstance?
Would the fact of my sensitivity be an aid to finding a constitution remedy?

Thanks for any feedback. Now I'm in a difficult situation at the school and may have to drop out.