Denis99, I’d think about getting out.
I know it will feel good to stick it to the boss over the filter thing, and you don’t want to feel like they’ve pushed you out of your job (i.e. won), but if you’re stressed and ill, you don’t need the hassle of it all.
Take your month or so off and get well, then look for another job, and move on. Work towards your future, instead of the future of a company you don’t want to work for.
If you still want to push the filter issue, put the info in your notice email and copy in everyone (reps, managers, directors, suppliers…. everyone!). You cant do more than that, so if they still want to ignore your good, professional advice, f@*k em, it wont be your problem anymore…
Just my advice, but hope you get sorted either way.