I’ve just been told I need to do 4 hours before I can go home sick or I will accrue a disciplinary point

I never call out of work. I have over a hundred sick hours (supposedly) at my disposal. I’m in a labor union, in one of the most progressive states. I have crippling insomnia. I’m just now being told if I don’t show up and stay for at least four hours I’ll receive a point on my record that won’t be gone for a year. It will inhibit any promotion I apply for, no matter how hard I work. Fuck this stupid country and the fucking unfair labor laws.