Was this a panic attack?

Last night I couldnt fall asleep so I got my laptop and sat in bed surfing the internet. Around 3:30 am my whole body suddenly started uncontrollably shaking as if i was cold, but i wasnt. My teeth were chattering and my pulse was racing. But it felt as if my heart was slowing down and I felt pressure on my chest. I didnt know what was going on and I felt sure I was going to die. My family has a history of anxiety disorders so I figured that was the cause, therefore I didnt phone an ambulance or anything. I just sat in bed and tried to reassure myself that I was okay while taking slow deep breaths, and eventually after what felt like the longest 30 minutes of my life, all at once the shaking and everything stopped. Was this a panic attack?