ebay has smiley face ballons wearing a nurse cap, nurse rubber duckies, etc. jsut search for "nurse party"
they have mini first aid kits for about $2 that would make cute favors
I'm thinking tongue depressors could be used for something......
I would put snacks in large bowls with typed RX labels taped on them. Name: Doritos, For:Nourishment, Directions: Eat in small quantities until your fingers turn orange.
Or something like that (sorry, I am getting tired)
gloves turned into ballons
invitations something like:
Your invited to (insert last name) Hospital on outside.
Inside- Date of Exam (date of party) Time of Exam,Hospital Address:, Condition: Education Symptoms: Silliness, Happiness, all over goofiness Remedy: Spend time with friends and family and eat birthday cake. include clipart a nurse followed by " To confirm/cancel your appointment please call or email Nurse (your name)by (date).
hope this helps you get started