If there is no obvious reason other than pain for revising the hip, then it is possible that the revision procedure will not give pain relief. This is because the initial diagnosis may have been wrong (i.e. pain was not from the hip), or you have developed regional pain syndrome or even sustained some nerve damage at time of initial surgery (a known complication).
Good reasons for revising a hip are infection, wear associated loosening, fracture around the replacement and repeated dislocation.
Without knowing all the history, it is difficult to counsel somebody but I would ask you to change your expectations regarding the procedure. You are of course entitled to getting a second opinion and I offer all my patients this if there are unexplained reasons for pain despite appropriate investigations.