Alice in Wonderland Syndrome - The Basics
You're hallucinating, and you know it... Time is messed up. First it seems slowed, then it seems to be speeding up... Even more noticeably, when you look at your body, it seems to be morphing. You're getting smaller... Minutes later, you're growing larger and larger.
That's a description of "Alice in Wonderland" syndrome, a rare form of Migraine aura.
Learn more in Alice In Wonderland Syndrome - The Basics.