This has only happened a few times.

I am noticing a definite lull in my energy levels throughout some of my days.
I am NOT comparing these to the burst of energy I sometimes feel by being on sub.
No, this feels different. It's like an emotional and physical low. And it feels different from what I was feeling when I first started here.
Mid day I hit a real low-feeling sad and very vulnerable, too.
Then I feel OK, for another few hours only to get 'hit' with these same feelings in mid evening-around 7ish.

Has anyone else had or having this or something like this happen to them?