It doesn't sound 'nuts'. There are several studies that prove deep pressure assists in calming autistic children. Many sensory integration specialists use this technique.
http://www.grandin.com/inc/squeeze.html

Ditto to @A MyAutismTeam Member ! She is probably the most knowledgeable about essential oils (and a lot of biomed stuff). We also use a blend that includes vetiver via a diffuser (you can buy several of them on amazon. Easy to use, and directions included). We also use copaiba and ocotea topically (I am in favor of using just a couple of drops, diluted in several drops of jojoba oil, and massaged onto the bottoms of the feet). I would agree that vetiver in a diffuser for maybe 15 min in a well-ventilated area is a good place to start for our kids that need help in calming and focusing. Good luck!

I know it's not crazy, but whenever my friends who have 'typical' kids see this, they crack up. They know me well so we laugh together. :)

None of that worked for me. Massaging worked though. Now it's more like wrestling, but she gets out all of giggles. i also let her roll herself up into a burrito and sit on her, or let her sisters sit on her. I know it sounds nuts but she loves being squished and pushing against anything.