Can I get fired from my job for being injured on the job and calling in because of the pain from the injury

That would be illegal and would trigger your severance package. You would also be entitled to additional damages if you are able to prove that the decision to fire you was connected to your injury and/or need to take time off for medical reasons. Please contact us at the number below should you lose your job or should the employer give you a hard time because of your medical absence(s).