IF you have doctor's orders with respect to the injury/disability that you have written about then the disability period precluding the employee's return to work can overlap the twelve (12) days off under FMLA (Federal Medical Leave Act).
I suggest that you get your treating physician to write up a written work release as to you based upon your disability and submit such immediately to your company's human resources department with an expected date of return.
As to being terminated because of such, your employer potentially could do so, but to legally be able to terminate you due to a disability it must be demonstrated that there has been a down turn in the economy justifying cost cutting measures or that you simply are no longer capable of doing the job that you do.
I suggest that you follow up with this answer by consulting with an attorney that practices employment law.
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