The signs and symptoms you have described don't meet the criteria for a diagnosis of CRPS. Its a difficult condition to correctly diagnose and it should have taken a lot longer with a far more detailed history taken and more detailed examination done to make such a positive CRPS diagnosis, especially since none of your signs and symptoms are particularly remarkable and you are barely over the surgery itself.

You are only 2 months out from your surgery. That is nothing at all. Pain at this stage wouldn't technically even be diagnosed as chronic pain. All or virtually all of the things you are experiencing could be entirely explained by the normal post-operative healing process or even by a delayed post-operative healing process. Even a delayed healing process doesn't necessarily mean anything is wrong - some people are naturally slower to heal and fully recover than others. Sometimes the body will take longer than expected to settle down after the disruption from surgery. In those circumstances, a diagnosis of CRPS is not correct as there must be no other possible reason which could account for the signs and symptoms you have. One issue with CRPS is that all of the individual signs and symptoms it produces are also generated by many other conditions or processes in the body. One of the issues with all of the awareness raising that has gone on even in the time I have had the condition (8 years) is that whilst genuine cases are still being missed, there seems to be an increase in incorrect diagnoses being made.

A cynic might ask whether the diagnosing doctor realises that he can perform additional procedures on you and rake in easy extra cash. If he has diagnosed a post-operative chronic 'condition' with a name this gives him an insurance code to allocate costs to whilst generating himself some nice easy profits. It will be virtually impossible for anyone to ever challenge him because the signs and symptoms of CRPS typically change over time.

You may well want to take the medication as there is no point in suffering neuropathic type pain unnecessarily and it is thought that poor post-operative pain control can contributes to the existence of chronic pain. Do your research on the block and consider the risks v rewards of the block - if nothing goes wrong you will be fine in a few days but there are always risks, however small, with these procedures. The very best thing you can do is to be as normally active as possible - subject to your physio's instructions of course but the worst thing you can do is not to use a limb or to guard it because it is painful. Crack on and do the physio and then get straight back to plenty of normal activity to minimise the risks of future problems.