Still, cutting your dose like that…there is a strong argument that that is malpractice; being yanked off of a large dose of benzos without weaning down (because if your doctor did it the competent way, you would have gotten a step-down schedule) can not only lead to the withdrawals that we all know and love, but cutting your daily intake/habit (doesn't really matter which it is if you were taking them as prescribed by your old doctor) puts you at a high risk for seizure.
My ex used to take 15+ bars a day, and when he was drinking (a handle a day, but he was never doing that regularly at the same time as the heavy bar use; before the bars he was doing this daily, though) he'd still be taking xans on top of it. Long story short, he's now on a veritable pharmacy's worth of god-awful seizure medication (he now gets them regularly; I have seen it everywhere from on the couch to on tile floor at work) and Klonopin, which most of us know is the devil's very own brand of benzodiazepine. He turned into the walking dead on i
At any rate, I would (in vaguer terms, of course) relay these concerns to your doctor. Hell, you could even tell him that your family has a history of seizures and that's why you're concerned. But cutting in half without weaning, that's just stupid, lazy and reckless.
Of course, it sounds like your doc is a little bit wary of you and drug-seeking behavior. I've been in the same boat with valium and xanax, and the funniest part is that I fucking hate benzos and the only time you'll catch me taking my script is when severe anxiety kicks in, which rushes acid to my stomach and irritates my ulcerative colitis. But it really doesn't matter WHY he cut you down, what matters is HOW, and whether he gave serious consideration to the possible consequences. Try the angle where you admit that your previous script was probably unnecessarily high, and you want to get down to his recommended dose, but that you don't feel comfortable or safe doing so in one fell swoop.