Dear, first I did not understand why do you want to register your medical certy? If you want to use it for your employer go and get it from medical commision.you have to pay some fees and they will give you fitness certy which is enough for your employer instead of going long procedure of your Indian certy.
Our embassy is attesting, it does not means that said certy is legal document and look that attestation what kind of endorsement embassy wrote.foreign affairs is only checking that the seal and signature of our embassy is ok, they are not giving gaurentee that said certy have legal stand but saying that this certy is registered @ embassy.
so easy thing is get letter from your employer and go to medical comission , have a fresh examination and get it from their.
good luck