Well I'm glad you took thing into your own hands and started taking something. Hoping that your symptoms lift for you and there is no irreversible damage.
. Educating her is your only choice and if she refuses then you seem to know what to do. Find another Dr., preferably one that will be all over this. Best of luck to you!
I guess I just see it as how close you are to being out of the normal range isn't ok, why not just treat it before it dips below. I don't understand why Dr's do this.