A lot of what you are describing sounds like CRPS. If you look at one of the CRPS websites you can see the Budapest criteria for diagnosis.

The only odd thing is experiencing the burning immediately, as that doesn't usually come right away. That might indicate an actual nerve injury.

Either way, as I can attest, dealing with Worker's Comp is a nightmare. My injury date was 6/11/15, still going cause I'm not yet "permanent and stationary". Get a lawyer, as others have said. One of the most important things you can do. One of the best things my lawyer did was help me find a better doctor, believe it or not.