Help please

I'm 37 weeks and 5 days and for the last couple days I've been feeling really fricking moody. Kind of like Pms Symptoms without the cramping. I'm crabby and can't really sleep. But most of my pregnancy has been smooth sailing for me ( knock on wood) any of you moms out their get really moody or grumpy before your LO Came?  I feel like I just want to yell/punch someone or something and my tempers so short. Help!