I tapered heavy use of IV flunitrazepam under medical control in few months, for what I've learn needs a less potent benzo with long blood life to take up to 4 times x day, 1 sleeping pill incuded.
Valium can be the first to use, then prazepam, lormetazepam and bromazepam, better if taken in drops because it's easier, anyway I strongly advice you to talk with a psychiatrist and get a tapering schedule and a every week visit to see how it goes.
Good luck!