Help me with my panic attack during meditation

Today when i was doing "space between breathing" meditation i experienced something strange which caused me to panic. When i got deep enough in meditation, gradually space between my breaths expanded and my breaths became very shallow. I could no longer feel my breathing. Also i lost sensation of my body and awareness of environment. I entered a silent dark space which was very tight. I felt like a vibrating round mass. The vibration gradually increased and also i felt a really hot sensation in my body. As heat increased i felt as if the space became tighter. Then i had the panic attack. My heart start beating very forcefully and fast. I couldn’t feel and move my body. I couldn’t find my breathing. It took me so long to find my breath and get back to awareness. I am so scared i cannot meditatie again. I was wondering what was this sensation. is this feeling normal. How can i avoide the panic i experienced