Thank you very much for your answer and will indeed seek the help of a retina specialist!
Dear Gobfather,
I would recommend that you seek the care of a retinal specialist. You may have a posterior vitreous detachment which is not completely separated, so the there is a large floater.
Dr. Feldman
Sandy T. Feldman, M.D., M.S.
ClearView Eye and Laser Medical Center
San Diego, California