If you are let go after requesting reasonable accommodations for a disability, (including hearing or sight problems, mental illness or even a perceived disability) or your request for reasonable accommodations
is ignored, you can file a complaint with the federal EEOC of discrimination. Once you report the disability to your employer you are protected by federal law from adverse actions until the accommodations process has been completed. This includes being fired, demoted, loss of benefits and/or perks.
If the EEOC issues a cause determination in response to your complaint, you can file a lawsuit by hiring a lawyer on a contingency payment agreement. The majority of lawsuits filed (70%) result in damage payments to the injured party of an average of $40k. Additionally if you file a discrimination complaint, its against federal law to retaliate against you by providing a bad reference. The same protection applies if you report waste and fraud to a government agency.
If you are given a false reason for being fired, consider whether or not you may have a discrimination claim. If you are fired for a disability, (unless you were able to perform essential job duties,) you have cause for filing a discrimination complaint. The Federal EEOC has an online process for filing complaints.