You can immediately write to your CE and explain exactly why there is “no chance” you will find a job.
You may not bring family or friends into an OWCP examination. You may bring a physician to a second opinion (“SECOP”) examination arranged by or for OWCP.
This assumes the exam is a SECOP and NOT an “independent” or “impartial” medical exam scheduled to resolve a medical “conflict”. In that case, you are required to attend unaccompanied. If this is a SECOP exam, and you have the resources to bring another physician and wish to do so - go ahead! Tell the CE RIGHT NOW that you wish to do that. The examination may need to be rescheduled. If so, do that immediately. It is your right to have a physician attend your SECOP examination but do not delay in informing OWCP that you wish to exercise this option.