I know very little of your story, but I do know about chemical sensitivity because I have it. Mine's not as severe as it used to be (thankfully!) but it was definitely a contributing factor when I moved from Winnipeg to Saskatoon. Winnipeg isn't nearly as big as Vancouver, but it was too much for me -- the smell of the cars and perfumes, everyone right on top of each other. Yuck.
Of course, only you can make such a huge decision, but if your sensitivity is severe, it seems like the city isn't really an option no matter how strong your heart drives you there. Daily headaches, nausea... not something I would want to endure, no matter how great the love!
Gralson: my husband (works out of town).
Auto: my girlfriend (lives with her husband Zoffee).
The most dangerous phrase in the English language is "we've always done it this way."