Lots of kids with SPD wear Under Armour shirts that give you a feeling of being squeezed a little, providing that same relief that a chewy or blanket may provide. I know they also come in adult sizes. In addition, my daughter wears a weighted belt if she needs to calm down. The SPD-specific ones are ridiculously expensive, but if you look for a weighted exercise belt, they're much more reasonable. I'm pretty sure Reebok makes one that's about $25. According to my daughter's OT, ideally it should be 10% of your body weight. Another option is the Wilbarger Brushing Protocol. It's supposed to be done under the direction of an OT, but I've read many stories about adults using it on their own and finding it helps them.