I have ringing in my ears as well as blurry vision from the RSD. Those are in addition to a host of very strange symptoms that are also from my RSD (poor balance, dizziness/nausea, nose bleeds, headaches, etc). They are absolutely in my case CAUSED by the RSD. I now wear clonidine patches to control the vision problems as well as the dizziness and ringing in my ears. Check out this link:

http://www.rsdrx.com/rsdpuz4.0/puz_24.htm

Maybe print it out and bring it to your doctor. If they still aren't willing to help you then get a new doctor who actually cares about you and your health. Many doctors are not familiar with the other symptoms that come with RSD so that's not unusual but if you show them that they are related then they should be happy to be educated and to help you.