Ever notice that even on medication the swings between manic an depression can be tough? the depression starts out small..something gone wrong..then another..then another..etc. Soon, where you felt you where on level ground, it gives way and you're falling. you grasp to stop the fall but one thnig about a hole is that it gets drker the deeper you fall. Soon you switch from tryng to stop yourself and climbing out to dealing with the darkness around you. when you hit that point, it really feels impossible to climb out again.