In my opinion, I would not go through with getting a tattoo. The risk of spread, even this early on is too high. No needle pricks, surgeries or other trauma unless absolutely necessary. Maybe one day things will settle a little for you, you will get your CRPS under more control and you can reconsider then. If you do decide to go ahead and give it a try but please use something like Emla to keep the nerves as settled as possible. If you have something drawn up, leave it as artwork on paper for now.