It usually passes if you persevere. I think you build a tolerance for it systemically (just a guess). I say this because my nausea, etc has never been as bad as when I did my initial application (face, neck, ears and one arm - way too much area in any case). Not to say it's negligible (refer above), just not as intense.
See if you can do one arm at a time, or even one side, or upper arm, then forearm separately. It's definitely worth the pain for the gain, skin health-wise. One other reason to split the application between arms is that it's easier to sleep, apply cream, wash, etc if only one arm is a ball of misery (in the last week of application and the 1-2 weeks after you stop).
Good luck!