What Causes Severe Mood Swings With Lack Of Concentration?

Hi, I am struggling with a combination of severe and prolonged boredom / lack of interest in anything / lack of concentration, mood instability / anger / oversensitivity / irritability, and periods of anxiety. It is affecting my study and relationships. When I have seen doctors they have diagnosed me with depression, but I really feel that this doesn t fit with everything I am experiencing, especially since I can go from elation to crying to anger back and forth several times in a day, often with no trigger or just a tiny trigger. I don t know what to do!