I had this issue too...still do from time to time. It's my understanding that most of the problems with dizziness and blurry vision are caused by spikes and drops in blood pressure (something the sympathetic nervous system is supposed to control but since ours is all wonky with the CRPS/RSD...we get spikes and drops out of no where).

The best treatment I found to help was clonidine patches. It didn't make the episodes go away completely but they were a LOT less frequent...I was having them multiple times a day before and went down to a couple of times a week (more if I was in a bad flare). I went off the patches last year after a miscarriage and the episodes have increased but not to the levels I had before. My flares have also been way down since I started treatment with tDCS...so I imagine that has contributed to the reduction in these episodes as well.