FMLA is a Federal program that stands for Family Medical Leave Act.
It is law that your employer grants you the time of no matter what size the company is. This leave is not paid by your employer. This is unpaid leave and has a duration up to 12 weeks.
This is designed to save your job or help your family when their is an illness or injury requiring extended time off work for yourself or an immediate family member.

It's best to get it filed as soon as possible. That way it will cover any expected and unexpected absences. My company required it to be filled out every 6 months. Was a definite pain but always worth it. Had to retire unfortunately at the end of last year so don't need to deal with it anymore. Hang in there!

I would file FMLA paperwork as soon as possible. It takes about two weeks

My husband had to file when I had my surgery to guarantee any time he might need. It didn’t disclose extensive details and just stated “needed to care for his wife due to a thoracic/lumbar condition”, so I would imagine yours could say “neurologic condition” without much detail. The doctor listed the valid date for one year, with up to X amount per episode/frequency. Maybe something like that could help you if you prefer not to have reduced-hours every week while giving you the option to use the time more sporadic as needed.

I would fill out your paperwork like right now I would not wait been there done that