I would think that all you need to address is the issues that you are having in class and that you are awaiting doctors documentation for accommodations. I would then ask what they would recommend in the mean time. I teach elementary school so what I can do vs a college level is different, but I would that that regardless, they may be able to help you out in the interim. As far as explaining the root situation, unless necessary, I don't think it is any of their business.

Hope this helps!

~Seanachai~