Assuming you are in the US. First, know that FMLA requires 1250 hours of employment over 12 months before you are covered (even if you worked 1250 hours by 9 months, you must have worked for that employer for a minimum of 12 months. In addition your employer must have at least 50 employees residing within a 75 mile radius of the site for FMLA to be applicable. Therefore a newly hired employee would not be covered under FMLA.
Accommodations for primary & secondary school (elementary & HS) are very different because education through age 16 (21 if disabled) is legally required and a right.
The ADA may apply, however you must alert your employer to your "disability" and the accommodations must be reasonable and necessary.
Facts from the EEOC on the ADA as it applies to healthcare workers:
Q&A on the ADA: http://www.ada.gov/q&aeng02.htm
You have no right to accommodation if you fail to request accommodation and reveal your disability to the employer. (i.e. if you are fired for excessive absenteeism, you cannot go back and say but I have a disability you need to accommodate me. )
You might want to discuss your concerns with your PCP and/or neurologist to work together to develop a plan of action/treatment.