The only thing I can think of is the ADA, but you'd need to ask an expert on that. Otherwise, if you were an at will employee you can be fired for any reason, and if you were contracted, it sounds like they have cause.
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Post traumatic stress disorder is a disability and if that is why your employer fired you, you should sit down with an experienced employment attorney for a free consultation immediately.
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You MAY have a claim under the Americans with Disability Act. You should speak to an attorney experienced in this type of claim as soon as possible.
If you don't know one in your area go to www.nela.org and search for one in your area.
No attorney client relationship has been created by this answer.
It’s crucial for an experienced employment lawyer to determine (after delving more deeply into the facts with you), whether you were terminated on account of the employer’s ‘well-founded’ reasons that you were performing poorly, or whether you were actually terminated because of your medical condition/disability.
If it appears that your medical condition/disability was the motivating factor for your termination, you may have a case of disability discrimination under the NY State Human Rights Law.
It would also be key to evaluate whether employees similarly situated to you have suffered post-traumatic stress disorder, exhibited similar symptoms, but still kept their jobs. If so, are you of a different race/gender/sexual orientation, etc from them?
-Denise K. Bonnaig