Brain fog is a common complaint among people with CRPS...I have had badly declining ability to focus, remember, and read over the years. For some this is caused by meds. I do not take any meds...so that's not the cause for me but its possible that just the constant never ending pain is at the root of the issue. All the tests for other causes have come up with nothing.

As for blurry vision...while o highly recommend looking for another cause...crps CAN cause vision problems. I had intermittent blurry vision, double vision, and dizziness for about a year which was resolved when my dr put me on clonidine patches...which regulate blood pressure. CRPS is a malfunction of the sympathetic nervous system which controls blood pressure. Turns out I was so out of whack and my blood pressure was all over the place so I used the patches for a few years and the vision problems stopped. I went off them when I got pregnant 5 years ago and I haven't been back on them. I have occassional symptoms of suddenly spiking or dropping blood pressure...but not nearly as often as I used to.

My recommendation is ALWAYS to search for other causes first because...well...other causes can usually be treated or corrected. But if you exhaust all your other options then new weird symptoms can typically be caused by CRPS. I just wouldn't assume it right off the bat because often it IS something else.