My son has many of the same challenges. Anywhere that has large crowds can be a challenge. Whenever we go to the store I put him in the cart for a little while to let him adjust. Whenever he is deeply focused he chews on his shirt(not even realizing he is). Adjusting to school was huge. We realized that in K there is sooo much activity in the classroom that he couldn't handle it. He was put in a desk near the class, but in his own space. This helped. During recess he would be settled in a place to play and could move onto the playground when he chose. He began speech therapy and behavioral IEP. This has also helped. He can communicate where more people can understand him. In first grade it was an adjustment period. The teacher set up a quiet spot where he could go at any time he felt a meltdown coming on. There are also other teachers who will allow him to come to their class to keep routine( substitutes there or drastic change in routine). It helps a lot to have a relationship with your child's teacher and others that are in contact with your child. It makes a huge difference. I have found a natural supplement called Focus for kids that helps him. He tells me it feels like it helps with his control. He has violent meltdowns with yelling and stopping and throwing. During these times I make sure not to yell. I give him a few minutes so that he will hear me, then tell him to go to his room in his cocoon. This is a blanket that he wraps himself in to block all stimuli from him. After a little while he will ask me for a very tight hug which he says helps him calm down. It's not always that simple and at times I have had him go in and out of a meltdown. I always remind myself that he is not a bad child, but a very unique special gift. That he is my constant challenge to be a better mom and person. I am constantly learning with him. I wish you well in your adventure and discovery. Pre plan all things you can. And communicate with him.