Welcome to the site!
So sorry for your hardship that caused you to have to go backward with your difficult children.
How were the medications working? Can you get old psychiatrist to get you in with someone in your new county? They will need to transfer records - perhaps he/she can recommend someone.
Sounds like the school needs to be reminded of the IEP goals. What of this whistling? Does he even realize he is doing it? Can he not stop? The school should have him go to a resource room until he can stop whistling. There should be things in place to assist him.
