Harry Potter and the Cloud with the Silver Lining

Harry is attacked in a Hogwarts corridor leaving him unconscious. He is taken to the Infirmary where Madame Pomfry tries to wake him with the assistance of Hermione. It is revealed that he was forced to take a potion that will cause great changes in his life. What will happen to his existing friendships? Will he be able to form new ones? Sightly AU Rated T for now.