There's some great advice here.
LITLOVE is correct, you must make your accommodations request in writing and
before they let you go.
Does your state have a Legal Aid division?
Does your state have a Disability Law Project?
Does your state have a Human Rights Commission?
Does your state have an Independent Living Organization?
(Some of the Independent Living Orgs have caseworkers able to advise you on local supportive services re: Federal ADA regulations.)
These are some of the agencies which may be able to help you.
I admire your willingness to continue working and your perseverance with your employer. An advocate may help, less stress on you.
I hope you achieve whatever is in your best interest.
DejaVu