So sorry this is happening to you.

My T. says she doesn't think this will happen with me ( phew and thank god) she said she doesn't have any DID clients that have achieved total integration and then dis - integrated again but has had DID clients that have reached what they thought was total integration but a few years later a new younger alter appears. not new as in just newly created but new as in that one was burried so deep under the others that it took a while for that alter to reach the surface. My T specializes and sees only DID clients, so I trust her judgement and what she says for me.