Welcome to the world of toddlers - UGH! I have four kids 8,7,4, and 2, and I KNOW your angst!! I always tell people that 2-3 year olds seem to need exorcisms daily! HA HA!
Here's what has helped us - all can be found using the link/site below:
Get the wonderful book?DVD - Happiest Toddler on the Block. Here's where you can get it - it's on the Mom's Picks!page
http://astore.amazon.com/motherandbabe0c-20/002-###-###-#... This is a God-send as it really helps you understand why they behave the way they do, and how you can stop it from escalating/happening!
Earplugs - may sound funny, but when you're about to crack - a little muffling HELPS! Keep a set in the car too!
Calms Forte - a homeopathic remedy that has calming herbs like chamomille....for kids and parents.
Finally, pick up a squirt botttle at any store. I know it sounds crazy, but it has been a life-saver to have one in the car and one chilled in the fridge for outbursts. My kids respond well to just the mere threat of the squirt bottle - lol.
Almost forgot - flax seed-oil (with Omega 3) really helps with moods and even brain development (kids and moms) - there is alot of info on the web if you research it. I put it in oatmeal, smoothies, etc and WOW what a difference it makes in ALL of us. It's amazing.
DEFINITELY get some you-time so you can decompress.
GOOD LUCK!