Yes, I know exactly what you are talking about! I have had the floor moving sensations. It is the worst feeling and very hard to describe. They did the blood tests but I didnt end up going for the MRI. They told me I had vertigo and they thought that it came on from a rough boat trip I was on. It actually went away by itself, but it took 2-3 mths. In my case they didnt think it had anything to do with the anxiety. Here I found this on the web, does this sound like how you feel? This is exactly how I felt! IT was really scary to feel like that but it did go away on its own eventually for me. I felt like the floor was rocking back and forth just like a boat floor would. Good luck to you!

Vertigo is a type of dizziness that's characterized by the sensation of spinning. It's sometimes referred to as a hallucination of motion. Imagine what it would feel like to be placed suddenly on a roller coaster that won't stop, and you begin to understand the alarming symptom of vertigo.

A fairly common cause of vertigo is labyrinthitis (explanation below). This type of vertigo may occur after a flu-like illness, severe ear infection, or may have no clear cause. It's usually self-limited, meaning it goes away all by itself. But it may intermittently reappear over weeks to months. Bouts of vertigo are commonly treated with meclizine (Antivert).