Getting a write up because I called out due to an increased risk of more intense or convulsive seizures.

I work in fast food. Having a convulsive seizure at work isn't really an option when 1. None of the employees are informed that I even have seizures and look at me like i'm insane during small ones and 2. The manager writing me up demands that I move 1000 miles per hour my entire shift knowing i'm disabled and snaps whenever I stand still for more than .2 seconds.