You should get it checked out as others have said. I have a retinal scar that acts up and does similar things although not to the same degree. My scar is in the lower portion of my vision and can cause things to look distorted, or blurred. The doctors have no idea what caused it, and don't really care since it's not growing.
Looking at an Amsler Grid might be a good thing for you to do. It would tell you real quick if it's a migraine problem that comes and goes or a more serious retinal problem that is not going away.