Brief Answer:
Chemical sensitivity reaction:

Detailed Answer:
Hello and welcome,

This sounds miserable. Many people have reactions to irritants that we inhale. Some people are more sensitive and this is the reason that allergists post signs in their waiting rooms asking patients to not wear perfumes there. This isn't to avoid allergic reactions but rather because people with allergies are even more sensitive to inhaled irritants. But it isn't just you: The human response to noxious chemicals in our environment is on a spectrum - at a large enough dose of exposure to a chemical, everyone would react.

Many people find it difficult to walk down the aisle of cleaning products at the supermarket. It is thought to be a cholinergic response to irritants we inhale.

I see that you have a history of 2 sinus surgeries which tells me that you may have a history of allergies or irritant rhino sinusitis. And this reflects that you may be more sensitive than some to irritants.

You have a real medical reason for asking this coworker to please abstain from using spray on his clothes. Lay it out that you understand why he might like to spray this on his clothes, but that you have a sensitivity to sprays like this and have had 2 sinus surgeries and could he please not do this for your benefit. That it is very very important given your past history and current reaction, and you wouldn't ask if it wasn't.

And if he flatly refuses, you may need to talk with your supervisor about the situation or avoid him in some way.

I am really sorry. I can empathize as I have sensitivities to outgassing chemicals too.

Please let me know if I can provide further information or clarification. Good luck to you.

---