Okay, about playing the Aspie card, or more formally signing up for disABILITY Services and requesting reasonable accomodations under the Americans with Disability Act.
For example, the centrality of the class is learning the material and demonstrating your knowledge on tests. It might also be giving four or five speeches during the course of the class. What is probably not the centrality is participating in goofy in-class exercises. And you should also be able to have a seat, whether the front of the room or the back or the middle, where you feel more comfortable.
To do this, you'd probably call, visit, or email and set up an appointment with disABILITY Services.
And beyond that, I don't know the details. I am self-diagnosed, and people in middle age like me are often going to be self-diagnosed.
One good method of contacting the professor is email followed up by a phone call. When you visit him or her, it's perfectly appropriate to have someone with you. What I got from Herb Cohen's book You Can Negotiate Anything (not strictly true but I love the idea!), is that this is not a sign of weakness. This is actually a sign of strength. I mean, mayors of cities do this for crying out loud. This person with you can be a friend, can be a brother or sister, can be a former teacher or coach, or can be someone from disABILITY Services. If the person is older, you and your situation might be taken more seriously. Shouldn't be that way, but probably is.