P.G.
You might want to check out the library for the Love and Logic parenting books, just in case it's not just teething. 2 is a VERY hard age for kids cause they're really becoming truely independent persons with their own minds. It can be very frustrating for them because they have little control over the world, and their communication skills are mediocre usually. The whole thing about L&L is giving them as much control and choices as you can when it DOESN'T matter to you. Do you want the red or the blue, do you want to open it or do you want me to, etc. Then when they're acting up, they get to chose to act up and get punished or stop and be happier! LOL. It seems to be working with my guy, and he's only 2 - pretty easy going, though.
Good luck!