JARM big {((((HUGS))))) to you. I know that feeling oh to well.
When I feel like that, I just sit back and let the DC do as they wish. (within reason of course) Then they soon see that they cant wind me up! I end up having a few tears and then my DSs come and give me cuddles.
I think it good for DC to see us cry and feel unhappy sometimes. Then they know when they fell unhappy and sad, they can cry to and say how they feel. My DS2 does it, has a cry and says that his day has not been good and that he really needs a cuddle. then we all end up having cuddles. (although we have cuddles everyday before bed time)
Hope you feel better soon
I think its one of those days for us all as we all semm a bit down hill today!