how do you get past stomach bug fears

apparently norovirus is making its rounds where i live, and i just found and panic bought a pack of bleach wipes to wipe everyday surfaces (like doorknobs and phone cases), and debating getting cavicide spray like we use at the tattoo shop for regular cleaning (tables)

i have a serious fear of vomiting and getting sick, and haven't had something that severe in decades when i was 5, and i'd like to keep it that way.

some people i live with has minimum care for hygiene, and have seriously relaxed their habits with handwashing after we came out of lockdown from covid. one of them also works in close proximity to older people. i already sent them articles about how to clean surfaces and wash their hands, but since they know i have anxiety, they'll probably just say im exaggerating. i'm sorry, but i don't want to be puking and shitting for 24 hours at the same time, we don't have enough bathrooms for that...