Had to search for a bit, but here is a thread which kind of explains the dizzy movement. There is also a reddit which covers the camera angle drop..

It is most likely the result of broadcasting movement and/or mouse (for camera). Because it a behaviour of the game, you end up needing to "just deal with it". As luxlunae said, a "step back" mapped key broadcast to all should stop the movement, you may also want to setup a Camera position macro (or saved camera position) and issue that.
eg:
/script SetView(5);SetView(5)
Note: according to WoWWikia if you have not specifically saved a camera position to one of the slots, then these will default to standard positions. I believe 5 is the default view. This is also discussed a little on this thread.