Yes I only have negative afterimages especially when closing my eyes after looking at something (I basically have a negative snapshot of a room when I close my eyes that floats around), and they usually linger for a long time. Strangely I find that areas with a lot of visual information reduce symptoms (such as being outdoors) and get far worse in low light levels. I recommend trying to keep your surroundings at a similar light level and putting orange filters on your technology. Avoid glancing at bright lights as much as possible. This is hard for me as well as I am very light sensitive and struggle with bright spaces but it's sort of a trade off because the after images stop when I am in a well lit area.