[Ileana]

If I were you I would listen to her. She's unto something, being on that medication for too long can have permanent effects. She doesn't want you to suffer that and that's admirable because most doctors aren't that concerned with their patients long-term drug use side-effects. There are always other drugs you can try and though they all have side-effects they don't all have such serious ones as this one.
I guess you should just brief yourself on the drug, what it does and it's permanent side-effects. If you find it is worth it to risk it and keep taking it, it's your life and your decision. If you find she's right and it is best for you (in the long run) to stop it then you do that. Just don't go against her advice without knowing what you could possibly face if you keep taking the medication. If you know and you still want to take it'll be your responsibility.