There are typically no laws compelling the employer to return you to work after such an extensive leave unfortunately unless they have a written policy promising that you would be returned to work.
Given that, you would not have legal recourse against the employer unless you can prove they are discriminating against you based on a disability or other protected status. A cause of action for discrimination for taking medical leave is only viable typically where there is an applicable statute protecting your job. The FMLA normally protects your job for up to 12 weeks, but no longer. I'm sorry.
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