Web development

I need some changes to an existing website. I need changes to a wordpress theme [login to view URL] What needs to be added to the theme is: - patients must only see doctors office details - Doctors must be able to contact each other directly (see personal phone number and email) - Doctors must be able to refer a patient to other doctor - a 3rd user (salesman /reps) that can contact doctors office and doctors can contact them. - Medical history of patients that doctors can view - Patient results that doctors can share with patients or other doctors (not so urgent right now. Can leave for phase 2) - Appointment reminders for patients (reminder that it's been 6 months since dentist or 1 year since full physical examination) - When making booking remove payment (on current theme) and replace with medical insurance select or cash - Page where I can add pdf documents that doctors only can search and email or print. - Ad space Thanks