Even if you did have CRPS then you have already been having treatments done and you have gotten better very quickly. PT and oral analgesics may have contributed to ensuring that you are almost back to normal in a rapid timescale so there would be no reason to embark on any other treatment now. If you had, had CRPS, the treatment you had would have been exactly the same. It may also be that these interventions have done nothing - the recovery process could have followed the self-same process without these things - you will never know.

There is no special treatment that you now need to try to get in a hurry. There is absolutely no point at all in having a lumbar sympathetic block done at this stage - you are already almost fully recovered and it would be a waste of time. It is not a risk-free procedure. The only reason for any doctor to give you one now is to make money out of an unnecessary procedure.

Going for another opinion isn't going to change the fact that you have recovered very quickly from an injury and have virtually no residual symptoms. Nor will it change the fact that you havent met the criteria to be diagnosed with CRPS. Many orthopaedic surgeons and physios would consider your recovery now to be good enough to discharge you and advise no further ongoing treatment is required.

Your CRPS specialist may well be a true specialist but if I had money for every time I've seen a healthcare professional claim to have specialist experience of CRPS when they patently don't, I would be very, very rich. You need to seriously consider whether it is in the financial interests of your treating physicians to keep you on as a patient so they get cash from every procedure or visit you have. Additionally, you need to think about whether they need to pin some kind of chronic diagnostic label on you so that they have a billing code for your insurance that allows them to keep "treating" something "chronic", rather than because you actually have a real medical issue that requires intervention.

The paranoia you mentioned isn't healthy. It's stopping you from putting this relatively minor injury behind you and moving forwards. People posting on here are focused on CRPS and research it extensively because they have lives that are decimated by severe, extreme pain and disability. You honestly don't need to be spending your time doing that.