To all the mothers who experience burnout?

ok, i love my kids to death, but lately, i don't even look forward to coming home from work b/c i know i have to deal with their yelling and fighting and i'm just soooo dang tired. MOst times i've been fine but lately (past couple WEEKS) I feel like i want to stay at a hotel after work just to refreakinglax a little bit. Is a couple of weeks like this 'normal' or is it too much? I know moms who say they've felt that way for a couple days then bounced back, well i don't feel the bouncing urge yet? whew! that was a long post!