Ok, I know that I'm really late on this post. I too have this kind of feeling sometimes. I'm glad to know that I am not alone at this.
I just found this post accidentally when searching about my condition. As I am having this feeling since my childhood(now i am 20) but never tried to find out what it is, because I did not know how to describe this feeling. Toller explained it in a very good manner.

It feels like a "WAR" is going on around me. And Yes it fells like size of some large objects are very Small and Some Smaller one a very large.

Every feeling explained by people here is happening to me.

Whenever it comes, makes me very uncomfortable.
Today I had an episode after a very long time.

I am not having any medication, neither I had any drugs/alcohol/ Not even a cigarette or Tobacco.