Your symptoms are concerning. “Red” has directed you to commit suicide and you have engaged in suicidal behavior without realizing it. Those may be symptoms of schizophrenia but they may not be. It is difficult to determine from a short letter.
Another possibility is disassociative identity disorder (DID). DID was formerly called multiple personality disorder. Some of your symptoms are consistent with the latter disorder including: “feeling like a different person,” loss of memory, the description of having an “nighttime personality” and “not feeling like yourself” for extended periods of time. DID is a rare disorder and only a trained professional could determine if you have this disorder.
No one should ignore the hearing of voices, when the source of those voices is not physically present in the world. Your experiences should be brought to the attention of a therapist and that is most especially true since “Red” has directed and encouraged you to hurt yourself. No person or thing that encourages you to hurt yourself is good in any way. You should immediately seek help from a professional. If before your appointment you feel like you are going to hurt yourself, you should drive to the nearest hospital, a place of safety, where you will be protected.
Yes, you should seek help. You are not being “melodramatic.” You have a problem that requires professional assistance. Therapists are trained to help; that is their job. They are familiar with the inner workings of the human mind. They recognize the many problems that can befall each and every one of us. They will not judge you negatively. They only want to help. I hope you are able to receive the help that you desire. Please take care.