Depression night

I don't know what happened, I was good all day. High energy, mobile, felt good, then suddenly it hit me at 5pm. I felt like I was crashing, I started to yawn, felt like I was going to black out, and it just got worse. I was ready to sleep at 7pm. Slowly the sleepiness wore off and it's now 9pm, I just feel down and depressed. I don't want to move, or talk, just cry. When I get like this, I tend to cling to specific people. I want a specific person to make me feel good, and it's not always the same person. Thing is, I can't see the person I want to see.. I should want to talk to my husband when I feel like this. I don't understand why I don't want to. I don't feel like writing, I'm too down for it.