Have the same problem myself with FMLA. Have all the symptoms of Myasthenia
Gravis. Went to ophthalmology doctor, then primary doctor, then referred to Neurologist. Primary doctor gave me a slip not to drive any equipment for 2 weeks while I go to Neurologist, but now they won't let me work with any restrictions. They sent me home saying they would mail me FMLA papers. After seeing Neurologist he gave me a slip for a month off work. Wait a week, no FMLA papers in the mail, call HR, we sent them out. Wait 2 weeks, no FMLA papers.
Go to HR Dept. they say they'll mail out another copy. I tell them I need them now so the finally print them out for me. Drive to Neurologist, they're closed. Finally get paperwork to Neurologist's office. Now they say he doesn't fill them out. He's the one that has me off for a month & having MRI, MRA & I have a muscle test coming up. Worried work will deny FMLA & fire me for unexcused leave. Not sure who to turn to for help, can't lose my health benefits, but I don't have a diagnosis yet.