Yes, therapy for Dissociative Identity disorder is very important. But be sure to interview the T first, on the phone or email, to see what he/she believes about it. Not all therapists believe DID exists. But the worst kind of T is the one who believes you believe, but T doesn't believe in altars anyway. But a therapist trained in DID can make a huge difference in getting you co-conscious and alters working together inside instead of fighting.