Is your boyfriend blase about it, or does he believe it too? Must not be easy for any of you...
It sometimes happens to me. I have very bad migraines that are associated with strokes in part of my family (my grandfather died of that), so when I have new weird symptoms I panic like crazy, even though it's pretty clear it as absolutely nothing to do with it, and I can know that very well as a biologist. I know it's irrational, but I still panic.
I'm not afraid of death at all, but non lethal strokes are one of the worse thing I can imagine.