This is a research study to find out if anxiety in patients with autism spectrum disorder are affected by a form of ear stimulation called transcutaneous auricular vagus nerve stimulation, or taVNS. Participants will learn how to self-administer ear stimulation treatments at home before starting the study. Over the course of a month, participants will self-administer ear stimulation treatments twice a day for a month. Each treatment will last up to 60 minutes (1 hour) and there will be a break of at least 30 minutes in between treatments. The study team will ask participants to complete a group of questionnaires at the beginning and end of the study. There will also be a smaller number of questionnaires completed electronically on a weekly basis. The questionnaires will ask questions about mental health symptoms that subjects may or may not be experiencing, including questions about mood, anxiety, and sleep.