What is it called when you feel like everything around you is moving slowly?

[kelseykat1]

I am a 21-year-old female who has been experiencing these spells on and off for years now. When these (what I call) "slow spells" hit, they hit hard. Everything I do seems to be at a snail's pace (even if I am actually moving at normal speed). The longest one I've had lasted about 2 hours (it felt like forever). The most recent one I've had, made me feel really uncomfortable; I felt like everything I was doing was slowing down to a stand still and that the world around me was speeding along at high velocity. I also felt like my fingertips were fatter and covering multiple keyboard keys at once, and I had a major sense of fear for some reason.

Please help me out with any advice you have!