Some of this is very familiar to me...though the cause for mine may be different than yours...but here goes.

Hives/Rashes - caused by inflammation which is all over the place with CRPS. Comes and goes for me but usually only during the worst flares.

Nausea/Vomitting - Drs attribute this to my high pain levels...again only happens for me during bad flares.

Dizziness - Due to sudden spikes and drops in blood pressure which is out of whack with CRPS as the sympathetic nervous system controls this. Clonidine patches helped me with this as they kept my blood pressure steady.

Nose bleeds - Also related to blood pressure issues as there are lots of blood vessels in the nose that can easily pop and cause bleeding. The clonidine patches help but also using a qtip and some Vaseline can help too.

All of mine were related to the CRPS...but I was checked out thoroughly to make sure there wasn't another cause before any was attributed to the CRPS.