My hubby has these for his migraines and they work very well if taken at the right time. However, with migraines you can get them in clusters so you may be ok for a few hours and it can come back the next day or even up to four. He tends to get these around a change of weather/season and also if there is weather depressions. There is a weather website that gives a migraine predictor which may help.
He's tried a few preventatives but none of them really work. I keep telling him to try the botox ..will help the wrinkles as well
He now takes a supplement which is magnesium, B its and Feverfew, not actually sure if it helps though but can't do any harm!
You're not supposed to take too many in a month either. With the stroke risk it may be because people who have migraines are supposed to be at greater risk but of course it depends on you, BP, weight etc I guess a doctor would assess and decide whether to let you carry on once you get to 65.
Migraines are still a bit of a mystery to the medical world (bit like meno lol), we can't find the trigger other than than dehydration, some stress and low blood sugar/not eating.
Hope you get some relief soon Hurdity!