I'm with you, man - I've gone back down to my lowered dose, and have the chills, the agoraphobia, the near-panic, et cetera. It's probably going to take me another 2 months to get down to zero, and then the real fun begins...
Alternatives: Phenibut hits the same receptors, but is arguably MORE addictive than benzos: it is, however, useful for a day or two in withdrawal, and legal. It can, though, cause some nasty headaches. Some say that Gabapentin and Pregabalin - anti-seizure meds - are also helpful. Of these, I've only tried phenibut: it feels like low-dose benzos, and might well fix you given the doses you're on - it's pretty inexpensive, too, but don't expect a high or full-blown benzo effect.
If you progress beyond anxiety to anything suggestive of severe withdrawal - tremors etc - then call your doc or ANY doc or go to an ER, taking evidence that you've been prescribed these drugs. I don't want to worry you even more: you've been on low doses for a short period of time, but it's not worth taking risks with benzo withdrawal.
And if you up your doses - well, you'll be back where you are right now, but worse, facing rebound anxiety and possible DTs if you run out. Being on a long-term taper is like living in a cage, as with any physical addiction: and they say it can take a long, long time to feel remotely normal again. Downs seem to give so much: but they can take more than any other drug, and once used daily for even a few weeks/months, always seem to inflict more anxiety once the half-life's expired than was there to begin with.
I have profound issues with anxiety and depression (not to mention substance abuse, obviously), and was fed benzos by a well-meaning grandparent as a kid, so taking them is like 'coming home': only now I want, desperately, to move out, and can't just quit without risking physical mayhem, maybe even seizure/death. Don't let it get that far if you can avoid it. Even tapering doesn't make for all that gentle a w/d, and it can take so long...
Good luck. Sometimes the easiest way to cope with anxiety, I find, is just to give up trying and lose myself in a shitty movie/novel/watch a whole dvd set of a TV series: distraction can be half the struggle.
Feel free to PM me if you want to chat.