Have just had my first dose of zoladex (goserelin) to prepare my womb. What could be a side effect?

Many Things. Hot flashes (flushing), dizziness, headache, increased sweating, decreased sexual interest/ability, trouble sleeping, nausea, change in breast size, hair loss, or mental/mood changes (such as depression, mood swings, hallucinations) may occur. Pain, bruising, bleeding, redness, or swelling at the injection site may also occur. Vaginal dryness may also occur.