Thank you for your question and I'm very sorry to hear about your situation.
Generally, because you did not start a workers compensation
claim and opted to take disability leave, the company has a right to terminate your employment pursuant to its disability policies.
However, if you have become disabled in status, as defined by the Americans with Disabilities Act, you have the right to ask for reasonable accommodations when you are returned to work. This will require a finding by one of your doctors that you are in fact disabled, as that term is used in the Americans with Disabilities Act, and then provide you with work limitations which you can present to your employer as a reasonable accommodation.
This will keep you from being terminated immediately for not being able to do the same job you used to do. However, if your employer can demonstrate that the reasonable accommodations you are requested present an unreasonable hardship, they are entitled at that point to terminate you for no cause (allowing you a right to unemployment
So, in short, you need to ask your doctor to provide you with a medical report which defines you as disabled under the A.D.A. once you are released to return to work.