Depression..regular mood swings&.i feel low most of the time, i feel lonely even if i am in a group of thousands&=..bad headache.

Multiple types: There are multiple types of depression. At your age it could be a sign of manic/depression. This usually is depression ccycling with extreme happiness then depression, meds. Also seasonal depression. This type of depression is characterized by depressive moods in the winter where there are shorter days and longer nights. This trype can be treated with light therapy. Of course losses cause depressi.