I always hope there will be some sort of warning before a crash of depression, but there never is. It's like I'm "fine" and then all the sudden I feel so empty, hopeless, guilty, and void. I never know what triggers it or how long it will last. It takes all the wind out of my sails and makes me so unproductive, which in turn makes me feel guilty and anxious. It also highlights how much I feel my worth is determined by what I can accomplish for others and to a lesser extent myself.