My son will be two next month, and he started doing this same thing a few months ago. He says a few words, but he can't talk really either. I know he understands, and he babbles a lot and is experimenting with sounds, but he just says words, not phrases. Anyhoo, it sounds like he's starting the terrible twos, which is probably aggrevated by his frustration at not being able to communicate effectively yet. I can only speak for my son personally, but he is very headstrong (like his mama!) and when he is frustrated or angry, he screams his head off. I swear, I have heard sounds come out of that boy that I didn't know existed. And if I try to comfort him, he gets ten times louder and angrier. What I do is ask him what he wants (i.e. "Do you want a drink? Are you hungry?" etc.) and if he won't tell or show me, I tell him to take it in his room. Not as a punishment, I want him to know it's OK to be angry, but I personally don't want to hear it. If he won't go on his own, (which is about 30% of the time) I will pick him up and put him there. I just ignore it and usually about 10 minutes later he is over it. It sounds like your son is a typical toddler. The best thing is to ignore him. I hope this helps!