During season five, House once again regains his ability to walk without pain after taking methadone but soon stops after nearly killing a patient due to an uncharacteristic medical error. At the end of season five, House's use of Vicodin reaches a level in which House starts hallucinating about a former fellowship candidate who is also Wilson's dead girlfriend, Amber Volakis, and a relationship with Cuddy. When House comes to the conclusion Vicodin is making him hallucinate and is taking over his life, he checks himself into Mayfield Psychiatric Hospital. At the start of season six, after spending time in Mayfield, House stops taking pain medications and with the help of Dr. Darryl Nolan, finds other ways to deal with his pain and other aspects of his life. During his stay it is revealed by Dr. Nolan that House suffers from clinical depression, has antisocial tendencies, an inflated ego and severe trust issues. Dr. Nolan at one point even took House to a gathering in an effort to make House open up to people. To help manage his pain House finds a short-lived hobby in cooking. Thirteen (Remy Hadley), Cuddy, and Wilson discover House is very good at his new hobby, attributing this to House thinking of ingredients in terms of chemistry.