Dear sweetbwio,
I would definitely recommend that you seek the care of an eyeMD. A sudden change in the number of floaters, flashing lights with your eyes closed or a curtain or shadow may indicate a serious problem known as a retinal detachment. Without an examination, it is impossible to determine whether what you have is only floaters or a more serious issue.
Dr. Feldman
Sandy T. Feldman, M.D., M.S.
ClearView Eye and Laser Medical Center
San Diego, California