It starts with me getting real tired and crabby. Then I start getting irritable. Next thing I know, something has me in tears that shouldn't. Then the game is afoot.
Blah. I hate that feeling.
I am just coming out of yet another severe depression. I'm trying not to worry about it coming back. T said that would make it more likely to happen and he's probably right.
Just keep doing as much as you can handle so you stay functional on some level and ride it out.