Exhausted, and losing temper easily, any advice?

Ok, I have a 9 year old son with Asperger's syndrome....I also have a 7 month old baby who still wakes up in the night to feed and cuddle....I feel physically and mentally drained, and exhausted, not to mention I cannot keep up with the mess in my house of all three boys, including my husband, and their mess. the Laundry is never ending, the kitchen is always a mess, and no matter how much I clean and clean, it goes back again and gets messy.....I have lack of sleep and have noticed in the last few days that I'm irritable, cranky, emotional, angry, and losing my cool fast......The holidays are coming and I do not feel cheery, I just feel angry and tired and stressed out....I'm getting angry at the baby, at my older son, and even at my husband....I'm crying constantly, and feeling so frustrated. I would never hurt my kids, but I just don't know what to do.....does anybody else have a similar situation? I've got family coming in 1 week and so much to do.....I wish I could just sleep, but I dont' even have time for that.....I just don't know why I'm soo angry and irritable and blowing up these past few days.....what do you think is the best way to handle this? any new parents going through something similar, how do you relax or deal with this anger and frustration? please help