If you're in the US, you're entitled to reasonable accommodations as a student with a disability (mental health disability). It might take time to get through your school's bureaucracy and to negotiate an accommodation but maybe it would be good to figure out how to do it in case you need to do it in any other situations, even if you can't get it set up in time for the first part of this class. Your therapist could probably tell you who at your school is in charge of accommodations for a disability, or you could look on your school's website for a disability office. That's where you'd go to find out how to get registered for accommodations. The website might explain what kind of paperwork they need for you to get registered. I think some schools don't have an office, just a staff person who may also have another job, but a lot have an office. Your disability has to be kept confidential from everyone except the people in that office if you go there and register. They can give you a letter to give the professor telling the professor you need accommodation x,y,z (such as an alternative assignment, or not having to give your answers aloud, or whatever you work out with the disability office I think). Your professor can't legally ask anything about what type of disability (it could be a physical health issue or anything) and you don't have to tell the professor anything about it. Sometimes the disability office will make sure the professor knows they can't legally ask, but you can ask the disability office for help with that if they don't on their own.