My son Jacob is the same.. Although he is getting better... its like he turned 3 and settled down a bit..

for example we had a major melt down this morning because we forgot to let him shut the car door.. 15 mins he screamed for before we just pulled over and reopened the door.. I kid you not he was all smiles then

I asked the CHN last month about his "odd" behaviour but she said it is perfectly normal.. highly frustrating but normal..