There are a lot of side effects after prk. The ghosting can be a normal postoperative complication from prk because of the dryness of the eyes. Once you get dry at the eyes, you may have high possibility to see things in blurry. You need to have the good rest, healthy diet and good habit of using your eyes. They could help you release the symptom of ghosting.
Well, according to your description, I have to say that it is possible for your eyes to suffer from eye infection or overuse of your eyes. First, you should know that prk surgery is used to correct nearsightedness, farsightedness, and astigmatism by removing surface cells of the cornea. In other words, we can say that PRK eye surgery is a type of surgery that requires removal of some surface cells within the cornea without blades and may be more painful than traditional laser surgery. Of course, this kind of eye surgery can be very beneficial for eyes. But on the other hand, if you do not take care of your eyes, making your eyes infected after the surgery, it will just cause some eye symptoms, such as ghosting. So for your situation, I will suggest you wear a pair of eye patch to avoid further eye infection.
Vision problem is one of side effects of PRK. About 1% of patients will have vision problems after taking surgery. The reason you have double images is the surgery have changed your corneas. Usually, this problem will be ended up within a couple of weeks. Since dry eyes will worsen ghosting, so you can take eyedrops. Or you can accept a second surgery if it is necessary.