If you visit the department of labor's web page it defines who is eligible for fmla benefits. Specifically go to:
http://www.Dol.Gov/esa/whd/fmla/
if your employer has 50 or more employees and you need time off for one of the following:
for the birth and care of the newborn child of the employee;
for placement with the employee of a son or daughter for adoption or foster care;
to care for an immediate family member (spouse, child, or parent) with a serious health condition; or
to take medical leave when the employee is unable to work because of a serious health condition.
if you qualify and your employer is refusing to accept your claim, notify your local labor board immediately. They can make your employer comply as well as direct you to the proper procedure to file a claim for unfair labor practices.
Fortunately for me, my job was in a cubical in an office and I did not have to take time off work. My employer made reasonable accommodations for me to keep me on the job. Good luck with your endeavors.