What county do you live in? As others have said, depending on where you live depends who you can get services from. This is due to how the grants are written.
I have taught PPCD and I am currently an Autism teacher in a public elementary school.
I feel for my parents, because having a child with Autim effects your relationships with family members and friends. I know because I have a son also. I stopped visiting my sisters all white decored/breakable house when he was that age because it was so stressful.
Be consistent!
Some people may even think your mean, but I can tell you first hand that the battles you take on NOW will make all the difference in the future.
I will never forget when I was talking with a grandparent of a child with 11 years old with Autism in my class and her son stood on the table in my room. (Had never done it before). When I told him to get down. She said "Oh, It's because he's an only child". I explained that he understood the rules in my class. Even though he did not verbalize.
My parents are often amazed when they come to my classroom as they sit and eat and act so appropriately. The parents tell me they can't get them to do it at home. I explain to them that I shape the behavior by returning them without saying a word, to their chair. It may take 20 times during the first meal. Then 10, then maybe only once and eventually not at all.
Your doing the right thing with the food. Remove it when he does not act appropritaely. As for the nose thing.... thats why they need almost constant supervision. I recommend to my parents create one room where they spend the majority of their time and you and your husbend and any help you can recruit take 1 hour chunks keeping them on schedule and engaged in meaningful activities, and when something like that happens... try and not make too big a deal.
You need to find a "Behavior Therapist" and look for someone to perform a Funtional Behavior Analysis" to try and determine the functions of your sons behaviors.
Also what many of my parents with young child are not told is as they grow up the behaviors change and are replaced with new behaviors. This is why we need to find you a good program to provide you with plenty of support.
Here for you.
E.S.