Kevin Sanders is a 34 year old man who has been feeling unusually irritable for the past week. He tells the counselor that during this period of time he has had increased energy and activity and sleeps less. Kevin admits that it has been difficult for him to complete reports on the job. His supervisor has become concerned and referred Kevin to the Employee Assistance Department. "I have rapid, pressured speech, and I can’t seem to stop talking." said Kevin. He adds, "I just can’t seem to sit still, either." The counselor notices that Kevin was easily distracted. Kevin is in good health and takes no medications. What diagnosis best fits Kevin’s symptom picture?