Primary objective:~-To determine the effectiveness of patient controlled methylphenidate as compared to placebo for the management of cancer related fatigue as determined by the Functional Assessment of Chronic Illness Therapy (FACIT)-F Fatigue score~Secondary objective~To assess the efficacy of as needed methylphenidate on pain, sedation and quality of life.~To assess the potential side effects of methylphenidate on appetite, insomnia and anxiety
To determine the effectiveness of patient controlled methylphenidate as compared to placebo for the management of cancer related fatigue as determined by the Functional Assessment of Chronic Illness Therapy (FACIT)-F Fatigue score.