This is Dr. David
I am sorry you had an episode of headaches from estrogen cream.
I agree with your doctor to try it one more time. this time you can try to take tylenol or paracetamol prior to the estrogen cream to see if this lessens the headaches.
headaches are a side effect of estrogen cream.
you can also use KY jelly or lubricating jelly with intercourse to help decrease pain
are you using lubrication currently?
have you gotten headaches like this before?
some doctors might recommend brain MRI scans for headaches like this, but these are expensive scans and will be hard to get in the UK given universal coverage.
and most likely the MRI scan will be normal.
and if your headaches go away if you stop using the vaginal estrogen cream, then most doctors would say you wouldn't need an MRI scan.
you need a gyn examination as well if you are sexually active and routine pap smears.
a personal lubricant like KY jelly will not cause you the headaches like the vaginal estrogen cream has and will help with the dryness during intercourse.