Answer: Unipolar depression
Explanation: Kelly suffers from unipolar depression which means that she does not go through the various opposite conditions / states as is the case with bipolar depression. Kelly has problems with severe depression, a depressive disorder where, after a period of such a condition, there is no the opposite euphoric conditions or states. Unipolar depression occurs periodically and can dramatically complicate daily life functioning as is the case with Kelly. The symptoms of this mental disorder which is actually the major depressive disorder that occurs in the episodes are, for example, not finding pleasure and enjoying the things we have done before that have caused us pleasure, too much sleep, depressed moods for most of the day or most of a certain period, loss of appetite.
