Yes, Anors.....
I know what you mean, I get a similar thing.....
Sometimes, its like a big wheel, and its swirling and swirling, round and round and seems to swirl into the centre....
Its very hard to explain.....
Here is another thing that I really like doing.....
Lying down, I stare at a light globe (switched on of course!!!) for a long time, trying to keep my eyes stready.....And then I look away, and there is
this patch of light that is left over from it. This patch of light seems to move around the room at will, and it changes colour......Try it, its
fun, Im sure someone may have a scientific explaination for it, but sometimes it moves very fast, and sometimes, it even stops....