BoingBoing, why were you taking zoladex?
From what you have said it sounds like you have hormonal migraine without aura which have suddenly become worse since you hit the menopause.
Migraines are very common during the menopause but I think you need to look at taking preventative medication as well as stabilising your hormones as much as possible.
I managed my migraines (aura without headache) with hormone manipulation for years but it suddenly stopped working when I was very, very post menopause and hit hormonal rock bottom. My migraine specialist said more intervention was needed and suggested either amitriptyline or venlafaxine (thought to be the best migraine preventative medication) so I opted for the former, partly because I had already done my own research and already bought some!
Both the above drugs are antidepressants when used at a higher dose but migraine and depression are closely linked and migraine aura is caused by cortical spreading depression. Oestrogen and serotonin production are closely linked hence the need for a TCA.
I would add that amitriptyline is also used for pain management so it could be a good option for you.
Have you had hormone blood tests?