I say this with love - stop reading the websites. My toddler (who is the same age) would have every disorder in the book if I read them all.

He sounds the same as yours, right down to the "rampant" episodes. We now say "is there a lion here" as he does a roar. That immediately diffuses the situation and rather than remember what he was frustrated about, he thinks he is a lion which is great fun.

Try and cut down the TV if it is worrying you but I wouldn't stress about it too much.