Hey Stacie,
I am in week 22 now. I found out I was pregnant at about 4-5 weeks, and I tried immediately to lower my dose... well, I tried to quit C/T then, but that sure wasn't going to fly... not a good idea, and I know that more now. I was on maybe 6mg at the time, so I went to 5, then 4 (I think) then 3 then 2 (trying to remember... sometimes it is not that easy) and from 2 I started going down by about 1/4mg no less than every 4 days... sometimes over a 2 week timeframe if I needed to. I was surprised how easy it really was to be honest. It was not till I got down to the very end that I got nervous, and a BIG part of me thinks that the whole problem at the end is mental, not physical anyhow... my mind was so used to waking up, having my coffee and my pill and then feeling 100% within 15 minutes... how could I function without that, right? Well, I can, pretty much, just fine...
One thing that might help you is this... you know how gross those darn things taste. Let them make you feel a little sick from the taste. You won't hold them under your tongue as long. I would only keep mine under my tongue for maybe 2 minutes, perhaps a little longer if I could avoid the taste. Then I would take a big drink of decaf and wash it down. I know you aren't supposed to eat or drink anything for 20 minutes to let it take full affect, but it seemed to work fine for me the way I did it, and that also helped decrease the dose, since not all of it was processed under my tongue. Just a thought to help you.
So, to answer your question, I am at 22 weeks now, started decreasing at 5 weeks, but knew I had a bit of time so didn't rush. You also have time. and if you are now only taking crumbs, you are already ahead of me! That is FANTASTIC!!! You will certainly make it, I am sure of it.
No, Xanax is not really an option. You can ask your Dr. what is though... there may be no answer. It may be to just get through it as best as you can. I have bad allergies and have been told that I can take Benedryl. That can help a little with anxiety as well at times. You can ask your Dr. about that. I have also been told to ask my Dr. about Trazadone for sleep and anxiety, but I am trying to stay as med-free as possible, so I have not asked. I probably should, but... I guess I am being stubborn

Imagine that, a stubborn addict...

. Interestingly enough, if I were not pregnant, I don't know that I would be coming off this stuff... no real drive to, I suppose. So, although it would be nice to have the option to take things like xanax or clonodine or whatever, I don't know that I would have incentive enough to not just give in and take more subutex. In a way, I think that my baby has given me the real push that I always needed.
Anyhow, I am here for you, and I am really glad as well to have someone to relate to. I have been (other than my specialist) very alone in this process. I do not have an understanding family where this is concerned, and can not talk to them about this whatsoever.