Hi MMoran.

I would be concerned about a doctor who is basing a diagnosis of RSD on the presence of cyanosis as it is not necessarily an early sign of the disease.
More often than not it is a swollen ,red and sweaty limb that is presented.
I have never had a doctor who was concerned whether I had cyanosis at all
It is only now after a decade of the disease am I showing cyanosis that isn't transient as I now have severe trophic changes due to continuing vasoconstriction due to an autonomic nervous system that has gone mad.
A more worrying sign of lack of blood supply is actually white skin.

Your description of transient changes is quite typical of early RSD and certainly not having ALL the symptoms ALL the time does not exclude you from the diagnosis and any doctor worth his salt should know that.
I wish you luck in you journey, lets hope there is another reason for your symptoms but please be reassured that even if this is your diagnosis there is still a good chance for improvement or remission if the correct treatment is carried out sooner rather than later.
Nice to meet you and good luck
Tayla