It's good that you are working with a doctor that you trust...that is so important when you are dealing with something like this. You should feel comfortable asking all the questions that you need to so that you are more comfortable with any procedure or treatment plan. I hope that whatever treatment you go with has good results...I know that it's a hard decision because if you decided NOT to do it you will always wonder if it would have worked...but if you do it and it makes things worse you will always kick yourself for doing something out of desperation. It's not an easy decision to make...so I do NOT envy you your situation. It's very good that you are looking at it from all sides and weighing the pros and cons so that you are making an informed decision. In the end...it will be what it will be and then you just move forward. Even if worst case scenario happens and the CRPS gets worse and you don't get any relief from the PRF...there are still other options out there for you to try. You just need to decide if that is something you are comfortable with and have a plan in place IF it happens. Sometimes you have to risk the losing to chance the winning when your current situation is just not good enough. Please keep us posted on what you decide and how things go. I really do hope that you get some relief soon. Good luck.