Frankenstein-Personal Narrative

I suspect that I am beginning to lose my mind. I feel as though my mind is no longer my own. In light of that fact, I felt it was necessary to write down what I have been experiencing lately. I’m doing this in the hopes that you will find this Corbin. I’m not sure if I’m going to survive this, and I want you to know what happened Cor. I don’t know if any of what I write will be useful, but I hope to God that it will be.
It all started when I first spotted the strangest creature I had ever seen.
At first, I thought it was just my imagination, because such a creature could not exist. That’s what I told myself at least. Then I began to see it everywhere I went. The creature would appear suddenly, and without warning. Every time I saw it, I heard
He’s-“ The creature yelled, and midsentence it just vanished. After that, I began to notice strange shapes coming into view in the distance, and I realized that I was now standing on what appeared to be the roof of a high-rise in the middle of an unfamiliar city. I looked over the edge of the building, and once again I couldn’t tell if there was any end. As I stood there trying to find my bearings, I was shaken from my thoughts by the sound of clanking metal. I turned to find the source of the noise, and saw a metal cage. In the middle of the cage sat a ragged looking man with manacles on his wrists and ankles chaining him to the floor of the cage. His clothes, if one could call those rags clothes, were tattered and torn. He appeared extremely malnourished, every curve of his ribs showing just beneath the skin. His hair was dark, and matted with filth, and his face was gaunt and sickly. In stark contrast to his appearance were his eyes. He looked close to death, but his bright emerald green eyes still seemed to be full of life, and they looked strangely familiar.
As I walked towards him, he began to laugh quietly, and the closer I got, the louder he laughed, becoming more and more manic by the second. The laugh, now an insane cackle, turned into a fit of harsh coughing
You see, whenever a sentient being is born, that being will be born into every other inhabitable universe. Every now and then, someone special comes along that can sense all the versions of himself that exist. We are one such individual.”
At the time, I felt that this was beginning to be too much. It had to be a dream. What bothered me, though, was the fact that if it was a dream, it was the most vivid one I had ever experienced. The man claiming to be me continued his explanation,
“People like us also have another ability. We can move between universes. Because of that, there are those out there that consider us dangerous. That creature that I rescued you from is controlled by those people, and they will stop at nothing to destroy every single one of us. They have already killed many of our alternate selves, and we need to find a way to fight back. I can no longer aid in the fight. My physical body is long gone. I’ve been trapped in here, trying to warn as many of us as possible, but I’m afraid soon even my consciousness will be gone.”
He told me all of this with such sincerity that I almost believed him.
“Okay, say I believe you, how many of us have you