If you have a valid medical excuse you must present it to your AI within a week of the absence. Finally, your AI can choose to award an extra 20 points towards your final grade if you have made outstanding and sustained contributions to discussion, have done additional work, or have brought useful resources into discussion. These points are made entirely at the discretion of the AI - you are not eligible for them if you have more than two unexcused absences from the section. Anything concerned with the class can be discussed privately with the AI or with Professor Wilk during office hours or by appointment. While it is usually best to talk with an AI first, any problem or issue can be discussed with Dr. Wilk directly.
Email is a good way to start.
These facts form the basis of our obligations to each other in the classroom situation. I consider it my obligation to listen carefully to your questions and answer them as well as possible given the need to finish the lecture. I will try again. Finally, I am obligated to be fair and explicit about grades, and about what to expect on exams. The other side of the story is your obligation as a student to me and to the other students in the class.