So a few nights ago I went to sleep at 12 and woke up suddenly a little over an hour later sweating and I seem to remember having a bad dream of some kind. Immediately I was overcome with what I can only describe as a sense of dread. Like something awful was about to happen and I could do nothing about it. I remember freaking out in my bed for about 30 minutes, attempting to calm myself down and realize that I was going to be fine, but it did not help. I decided that I needed to get up before something happened so I took a shower where I continued to be overcome with fear. After getting out of the shower I watched a movie to distract myself which seemed to work, but I still felt very scared because of how I had not been able to control myself moments ago. I was not able to fall asleep until 7 that morning because of it. 

Does anyone have any explanation for this or can relate? I have never had an experience like this. The only time I have felt somewhat like that was when I Thought too long about the idea of eternity, which caused me to begin losing my mind and control over myself.