I have taken multiple sick days and my job is now on the line. can I be fired for this?

No you can not be fired due to an illness. If possible, make sure to provide your employer with a note from a medical professional. If you are fired because of an illness you would be entitled to both severance and human rights damages. I would encourage you to visit the severance pay calculator our firm has developed to see what you would be owed if terminated (www.SeverancePayCalculator.com).