[cypher]

I wouldn't put hay in the cage again, that can definitely trigger allergies so that might have been a contributing factor if nothing else, I've no idea if the Chipsi stuff could cause a problem or not, I do react to chinchilla sand a bit if there's a lot that's been thrown around the cage & it gets dusty when I'm cleaning things out but it doesn't tend to be an allergen as such so it sounds as though nothing in your cage other than possibly the substrate should be a problem.
Allergies are very strange & unpredictable things in my experience but I hope you can sort this out & continue to enjoy life with Poppy.