What should I do in preventing my paranoia?

Yesterday, I heard a sound in the washroom at 11:00 pm while I was puting gel in my hair. It sounded like the cry of a baby. I got really paraniod because I been in past experiences that involved paranioa and went to the hospital. I went upstairs then began getting really scared and nervous. My heart rate was increasing fast and my hands were shaking. I had soo many negatives thoughts in my head because I thought the sound was inside my body. After that. I went downstairs and told my parents that my heart was beating fast and they were about to bring me to the hospital. However, my heart rate was decreasing and it was going in normal speed. I got really scared.Please can someone tell me if this is normal?? Maybe the sound was inside my house? or can it be from inside my body? I dont know but it is making me worry. Please and thanks for your help.