You can ask the treatment service to book you an interpreter. Interpreters are a free service.
Even if you speak some English, an interpreter can help to make sure that you and the treatment service understand each other.
Interpreters are trained professionals. They should never repeat any information about you to anyone.
DAMEC also has a list of people who provide services in many languages. You can search this list here. You can also call DAMEC for more information on (02) 8706 0150.