Employment Law Questions? Ask an Employment Lawyer.
I want to make sure that I understand your question. Are you asking if you would have a valid legal claim against your employer for the health problems you have now? Or for failing to let you have your old job back? Or both?
And for the employee?
I see. Unfortunately, there is virtually no way that you can sue successfully for your health problems. You would have to make the connection between specific actions and your stress, to your blood pressure, to your CVA... and even then, it would be unsuccessful for public policy reasons (we can't allow employees to sue employers for stress related health problems because of the effect it would have on employer's exposure). The botXXXXX XXXXXne is that you will not be able to sue your employer successfully for this. You might be able to sue for "intentional infliction of emotional distress", but that would be tenuous at best given what you have told me.
I am sorry, I know this is not what you wanted to hear, but this is the reality. My policy is to give the truth, rather than give you false hope now in hopes of earning a good rating from you, only for you to be frustrated later when you find out the truth. I do not control the law, please don't shoot the messenger.