I also have experienced these episodes, they began around age 7. Sometimes it would seem as if everything was moving too fast, sometimes too slowly. The episodes diminished in frequency until as an adult it is on rare occasion. Now my 11-year-old son is having this. I never found out what this really is. They have been labeled "anxiety or panic attacks" but that really does not cover it, and the meds that doctors prescribe did not stop them. Perhaps it is in the genre of deja vu, like a brief, abnormal "loop" of electrical brain activity. All I can tell you is that they are disturbing but harmless.