Hey AfroSpartaan,
Typically, just updating a username or email for other platform accounts shouldn't affect things in this way. What can change this would be linking or unlinking those platforms from an EA (previously Origin) account. Generally that progress would be stored at the EA account level, so moving your platforms wouldn't bring that info with it.
Unfortunately, there's not a way to transfer progress from one account to another. If that original account has since been deleted and cannot be recovered through support, I'm afraid there wouldn't be a way to retrieve that, sorry.