yes you do have to have amnesia today to get diagnosed today with it. but you need to remember that its not the every day garden variety of amnesia like forgetting your name or keys or what day it is that normal people tend to forget. amnesia with DID is a special kind of amnesia that goes beyond the typical and normal kinds of forgetting/ not remembering.

Since you have recently been rediagnosed as having DID then your treatment providers already have noticed this special kind of amnesia in you. You may not have noticed it but they did, other wise you wouldnt be diagnosed DID...

in other words dont worry about it, dont try and figure it out. since you just recently got your diagnosis switched from OSDD and Schizophrenia to DID that right there says they already asked you a mess of questions and based on how you answered their questions they determined that you do have this special kind of amnesia.

if you feel you no longer fit the diagnostic criteria for having DID you will need to talk with your treatment providers, they will go over again with you why they diagnosed you with DID and re diagnose you yet again if you have healed to the point of no longer fitting the diagnostic criteria anymore.