Overwhelming Wave of Inescapable Fear Meaning & Interpretation

"I stood on the beach. The ocean was quiet. Then I saw it. A huge wave in the distance. It grew bigger and bigger. It blocked the sun. I tried to run. My feet sank in the sand. The wave came closer. It was taller than a building. I turned around. There was nowhere to go. The wave crashed down on me. Water pushed me under. I tumbled around. I could not tell up from down. The water pulled me deeper. I could not breathe. I hit something hard. It was a rock. I held on. The wave pulled me again. I could not hold on. I let go. Then I woke up. I was in my bed. My heart was pounding. My sheets were wet with sweat. I looked at my window. It was raining outside. I took a deep breath. I was safe. It was just a dream. But I still felt scared. I closed my eyes, but I could not fall back asleep."