It might also be useful to get your name down with the Swiss Epilepsy Centre
www.swissepi.ch. They also have a diagnostic clinic there, which is used by a lot of the international schools in the Zurich area for assessment of English speaking children (for learning problems, not epilepsy). I was referred there by my paediatrician and subsequently sought speech therapy for my son. Only one English speaking speech therapist could be found and this lady was based on the opposite side of the Lake (i.e. not the Gold Coast). For your information, the charge for a session (45 mins to 1 hour) is CHF 145.00.
Good luck!