There's already lots of materials out there, but, this might help someone out. I am using the fantastic Monkey at the Doctor lesson the day before. And before that, the body labeling activity suggested by AlexMokpo, except I'm going to have them write the words on sticky notes and label a student in their group.
The first part I just want them to circle or highlight words according to their grammatical use. This will create a kind of color code, which will help us out for a role play later on. Ex.. I have ... (noun) = blue, so go through circling nouns in blue (the flu, a runny nose, etc). I am/My ___ is +verb+ing = green (Circle bleeding, choking, etc). I am, I feel/My ____ is/feels + adjective = red (Circle stiff, itchy, sick, etc).
Cut out and laminate the ailments and the solutions, to distribute to the class. Patients read, doctors respond.