Thank you for your response. This sheds some light on the issue.
If no gambling occurred at work and that is what the rules prohibit, then it appears that the timing of your termination based on their alleged reason would be a pretext or excuse for discrimination under the FMLA, which is illegal.
You need to immediately file a complaint with the US Department of Labor
for violation of your FMLA rights and also with the EEOC for discrimination under the Americans with Disabilities Act based on them terminating you because your back was not 100% and treating you as disabled. These are your two immediate recourses. The EEOC and Department of Labor will investigate and you will get a right to sue letter and you also need to begin looking for a local employment law attorney because from your account it looks like they are making excuses to violate your FMLA rights and rights under the ADA as well.
Furthermore, if no gambling occurred at work, you need to also file for unemployment, since termination for something that was not against their rules would not be good cause for denial of your unemployment benefits and that means that you might have to go to an unemployment appeal if they try to deny your benefits. If they do seek to deny your benefits and you appeal, you need to consider using an unemployment law attorney on your appeal as it greatly increases your chances of success and they do not charge up front, they take a small percentage of the benefits they win for you.
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