Being sensitive to the added smell of propane is a valid reason to go with green gas, but propane is not something you should be breathing in regardless. The smell is there so that you are aware that propane is in the air, and in your case, that you should be firing in a well ventilated area.
Can't force you to make your own green gas, but if the smell is lingering long enough to give you a head ache (which I think is just your body's remembered response to experiencing propane, similar to how you might feel like vomiting after smelling a certain food that made you sick in the past), you may want to think about firing in a better environment.
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