I fainted while driving. Since then, I have seen no less than 5 doctors who can't or won't help me. What can I do?

I am sorry to hear about this.  But no, I do not think you can sue a doctor for not being able to help you.  I also do not believe that a judge will force a doctor to treat you and a judge certainly will not force a doctor to "vouch" for you so that you can get your driver's license back. You are simply going to have to keep searching for a doctor who can help you with your medical issues.  Keep searching and best of luck.  NOTE:  This response is general in nature and should not be considered legal advice.  No attorney-client relationship exists or is formed by this response.