Inderal is a beta blocker I think and I am really not sure how long one can stay on it, but if your doctor prescribed you it, you may need for a variety of reasons. Did he/she originally prescribe it for anxiety and/or high blood pressure, heart issues? Sorry to ask so many questions but what kind of damage are you experiencing? Keep us posted!
Everything in your body can heal, dont believe anything thats says different.
It may take some time, but it is still possible