Hello I have a 17 year old daughter with austisun and ADHD i am just after some advice please she Also has a mental age below her age to. The problem is she has tantrums if things don't go her way or if you tell her to wait for something and if shethinks we are going somewhere and she don't want to go she will play up to try and stop us from going. Her tantrums can last from a hour to all day and they can stop all of a sudden they consist of self harm by punching her nose screaming crying saying hurtful things swearing and being rude and she has a obsession with death and dead people.