@Nannajay
As to side effects from Zoladex - minimal for me. I had the injection for 2 years alternating sides. Mine was administered by my GP and he always used a numbing spray. The injection on the left side gave me a couple of days of feeling like a period was due and that was it! The right side, no reaction at all!
We are all different and hence hope your experience is similar to mine - minimal!
Take care