One of the things that your sympathetic nervous system controls is your blood pressure...and with RSD your sympathetic nervous system is all out of whack. I know that I had issues with blurry vision and dizziness and this was caused by sudden spikes and drops in my BP. Since I went to wearing clonidine patches these issues have resolved themselves and I only have issues when I get bad pain flares.

I also have had many issues with my heart rate being ridiculously high...and they have concluded that this is because of the pain. I'm in so much pain so often that it results in a fast heart rate. When the pain gets REALLY bad I tend to also get chest pains. They have completely checked me out and there's nothing else causing it...so it's just the high levels of pain.