Unless you *do* have high blood pressure, or something else that salt specifically aggravates, it is not harmful in and of itself. (Well, chemically it is - sprinkle a little on your garden and see waht happens...)
I eat a lot of salt. When I cut back once in college, I started cramping. (That was before I read & heard that salt wasn't inherently evil, except in my soils class.) If it makes my blood pressure go up over 110, so be it. (It usually runs around 105/65.)
One bp reading is also not enough to make decisions about (unless it's very high), especially if doctor's offices make you nervous at all.

PS Just bought Eats, Shoots, and Leaves and after three pages I'm ready to go out with my Sharpie and make grammar corrections ;-)