I see. Thank you for providing this additional information.
The fact that the employer placed you on probation within such a short time after requesting FMLA leave would typically indicate that they may be engaging in retaliation for requesting FMLA leave. It is also unlawful under state law to retaliate against an employee for filing a worker's comp claim.
Therefore, even though you do not believe this is personal, the employer cannot simply terminate you because you filed for worker's comp benefits or took FMLA leave and doing so would typically increase the amount of severance I would demand from them in order to settle your claim.
If you do not reasonably believe you can locate other comparable employment in a year, then a year's pay would typically be reasonable to demand, but I suspect the employer is not going to agree to that based on the offer they have made to you.
What I would do under these circumstances is retain a local employment law attorney to threaten legal action for retliation under the FMLA and worker's comp laws to gain leverage in obtaining a larger amount of severance.
The employer is typically under no obligation to pay severance, but if you can convince them that you have viable legal claims, that would provide incentive for them to settle the case for a higher amount than they would otherwise be willing to pay.
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