Without those details, an attorney cannot answer your question. For example, did you file a worker's compensation claim for the job related stress? If so, you have some rights. Do you work for a company that employs at least 50 people? If so, you may have been eligible for FMLA leave, if you were out less than 12 weeks. Have you been diagnosed with a disability which the employer may be required to accommodate? If so, you may have rights under federal or state disability laws.
There is a wealth of information on this website from prior questions asked. Do your research and, if you believe your rights have been violated, consult with an employment law attorney in your area.