I dont know what to do about my boss, do you have any ideas?

Back in November my Neurologist wanted to try me on a new medication. The medication would have some side effects that would effect my memory a bit, but I did not know to what extent. Because I work in a kitchen I told my boss and my coworkers about the drug and what to expect. I thought I would get a bit of understanding from my boss. I work in a medical facility. Instead, she is trying to discredit me and trying to make me look like I am making many more mistakes than I am actually making. Blaming me for things that i did not do! I do not have a choice. I have to accept treatment for this medical condition I have. How on earth do I work in a place that actually bullies me for something I cannot control?