I'm currently on .5mg 2x a day, how long will it take to build up a tolerance? Will I have to up my dose for my anxiety to go away? I've read that it stops working after a while but I want to know how long so that I can talk to my Dr. about it. So how long will it take to build a tolerance to the point where I will have to up my dose to 1mg? Thanks. Also, I've been taking it for about 1 week.