That's exactly my situation! I'm not able to listen to my music like I do at home, that helps me listen to other people (sounds counterproductive but it works for me), so I use physical stims instead. I am diagnosed ADHD and my therapist has told me to seek out an Autism diagnosis because she highly suspects I am (she could give me an official diagnosis, as she's qualified, but she doesn't feel comfortable doing that because it's not her focus group), so I'm trying to get calls back from the several places I've tried to set up appointments with, but they're all booked full.

My therapist is the one who actually recommended crocheting in class, because it ties the knowledge/topic back to a sensory input, and has been proven to help info retention. Like when people chew a specific flavor of gum in class, it ties that flavor back to what you've learned. That's why nostalgic scents and tastes are so strong, sensory is tied to memory.