My condolences! I think I share that experience, actually. When I was little, I remember loving walnuts. I would sit with my grandfather and sister, and we would shell and eat a whole bowl full of walnuts between us. But now the very smell of walnuts makes me feel queasy.
I don’t remember why, but I think I must’ve eaten some bad ones at some point, and gotten sick, and now I associate the smell with being ill. A similar thing happened to me a couple of years ago when I got a pretty nasty stomach virus. The last thing I ate before I spent the next two days throwing up was an orange. It took me several months before I could smell or eat oranges again without feeling nauseated.