Threatened with PIP

I’ve been making mistakes at work, similar to ones my coworkers make, but much more often. I’m on Vyvanse. I’m really struggling with brain fog. I miss little details. My work involves coding. I have until March 17 to stop making mistakes or I’ll be put on a PIP. Any advice on how to have more brain power at work? Has anyone been in this situation and avoided a PIP? Thank you in advance.