Yes, it is possible for an alter (also known as a dissociative identity or "multiple personality") to reach out to the host (the primary identity) before the host is consciously aware of their dissociative identity disorder (DID). In some cases, individuals with DID may experience gaps in memory or periods of time where they are not aware of their actions or behaviors. These periods may occur when one of their alters is "fronting" (present and in control of the body and behavior) without the host's awareness.
In such instances, the host might later discover evidence of actions they do not remember or have knowledge of. For example, they might find personal items they did not purchase or notes they do not remember writing. They might hear from friends or family members about things they said or did during periods of dissociation that they have no memory of.
Discovering these discrepancies and inconsistencies can be disorienting and confusing for the individual. It might prompt them to seek help from mental health professionals to understand the reasons behind these gaps and uncover the presence of other identities within their consciousness.
Finding out about DID can be a complex and challenging process, often requiring therapy and support to navigate. Therapeutic techniques, such as talk therapy and trauma-focused therapies, can help individuals with DID integrate their alters, work through past trauma, and develop coping mechanisms to manage their condition more effectively.