Well, they seem to be - yesterday I added an iron supplement into the mix, and that seems to have gotten rid of the "whoa, drugs" feeling anyway (which means Wednesday might just have been an ordinary low blood pressure day after all - I was almost certainly due one). We shall see how things go after adding the other half a tablet on Sunday afternoon. I've gone back to keeping a diary to keep track of what's happening with all the various signs and symptoms, so I can give the trick cyclist a decent rundown of what's happening when I next see her.