Tricomb's right: I started self-medicating with benzos for anxiety/stress/depression/migraines, along with opiates, and though it provided temporary relief and kept me functioning, it really didn't take long for things to go to shit. Getting off (and back on and off and on and...) opiates wasn't that difficult for me, but three years on from starting regular, therapeutic use, I'm still trying to taper off of diaz - and while 44mgs will 'hold' me, and keep withdrawal at bay, NO dose does shit for anxiety: in fact, I'm more anxious than ever before, to the point of chronic agoraphobia, can't smoke pot anymore unless I'm on my own, and it's going to take years to return to any kind of normal sleeping pattern or my emotional 'baseline', anxious as it was.
But if, on a short-term basis, you're intent on using benzos for anxiety, then switching to diazepam is probabvly a good idea - start with 10mgs and work upwards if necessary, but take as little as possible. It's a long way down, and the higher you stack your dose, the further the fall.