It's like a scale where everything (reality) is always there, it's just that some days one side of the scale outweighs the other.
I know how you feel, PM. Those things are always there (the good and bad) and its just of matter which creeps to the forefront. The good news I assume it will be temporary. We have all have been there before with the tough stuff dominating your thoughts. When you're down, its hard to imagine otherwise.
I'm sure you have things that pull you out of that state. I hope you have the time to do one of those things today. Hang in there, PM. You are certainly one of the stronger, more patient, people in the threads I follow.
M:34 W:36 M:10 T:15 D:9 S:5 BD:12/12 Worked on the M for 6 mo before W saying it was over 5/13.