I also use Worlds Best, which is unscented, all-natural, biodegradable and dust-free. I don’t care for TidyCat because it is so heavily scented and because it is a clay-based litter, which often contains many harmful ingredients like sodium bentonite and silica; silica can cause respiratory problems:
Many clay litters on the market today also contain the chemical compound silica. When inhaled, silica is considered a carcinogen. The more your cat kicks up the litter, the more it gets circulated in the air and, ultimately, gets into their lungs, potentially causing respiratory problems. For cats with asthma, breathing in silica dust can irritate their lungs and potentially worsen an asthma attack.
Source: Catalyst
https://catalystpet.com/blogs/news/w...er-in-the-dust
I definitely think that it is possible that the TidyCat litter could be causing your symptoms.