My Grandson has been gradually increasing as the years go on in his tantrums. They have become frequent seems to have at least 3 a day. They happen when anything takes place that he does not want to do. Even getting dressed. They can last for long periods of time even up to 20 minutes. He does not like to greet people and if something is said that he does not like he will growl and frown at you. He seems to be ok Academically as well as motor and speach skills seem to be on track. He also says he can not smell. Very mean to his dog and little sister. Has seperation distress when people he does not want to leave. He firms up his body and you can not get him dressed or buckled into a car seat when he does not want it. There is obviously a big problem but some of the symptoms are in so many different disorders, bipolar, adhd, autism... Confused