We moved to a French / Dutch area 2 years ago, although French is the dominant language. I arrived with a French degree from a long time back, this did not mean my spoken French was brilliant. The children now speak more fluent French than me, after 2 years in French school.
We made the conscious decision to send our children to local schools, even though we are very priviledged to have the option of expensive international schools in English paid by the employer, we wanted our children to belong to their community. I signed them up for plenty of clubs in French straightaway.
In the first few months, I was still very nervous about speaking, I barely spoke to our children´s teachers. Funnily though, I thought one teacher really stood out with the attention she gave her little charges and one day we got talking, she is now one of my best friends and we talk nearly every day and even her parents have become de facto grandparents to our children. It´s done wonders for my French, having to speak it constantly.
It really really helps if you can make friends with a native speaker, even offer them English lessons as an exchange.
As for communicating with teachers and doctors, hopefully there will be another parent at school who speaks English, jsut ask the school, or perhaps one teacher if not your class teacher can translate. Our children´s school has many parents who speak no French, the head or teachers know the parents well enough that they know which parents can translate. It works great in our children´s school.