Continuing my ongoing endocrine treatment in Melbourne with insurance waiting period?

I am So sorry to see you are in this predicament ..... When do you arrive in Australia? 

Have you been an overseas student here before? 

Who is your Overseas Health Cover with?  Some are more expensive than others .... 
https://www.google.com/search?q=overseas+student+health+cover&oq=overseas+student

Have you arranged to see an Oncologist when you arrive in Melbourne?  They may have some ideas with helping you (eg on compassionate grounds?)

What other meds are you on, other than Zoladex?

take care & wishing you all the best