Pulled Under by Hidden Fears in Deep Water Meaning & Interpretation

"I was swimming in the ocean. The water was clear. Then something pulled my leg down. I could not swim up. I tried to breathe. Water filled my mouth. I could not see the surface. It was far above me. Dark water surrounded me. I felt so alone. I kicked hard. I pushed with my arms. Nothing worked. My lungs burned. I needed air. I could not get it. I saw bubbles go up. They were my last air. A shadow moved below me. It was huge. I closed my eyes. I gave up. Then I woke up on my bed. I was coughing. I touched my face. It was wet with tears. I drank a glass of water. I felt safe again. But I was afraid of deep water for weeks."