I have a little information. When I was seeking treatment for anxiety attacks, my doctor told me I could choose between a medication like lexapro, which changes some things chemically but is not mood altering, or a couple of meds like xanax that ARE mood altering and thus addictive. I was surprised, at that time, to learn that xanax was still on the market, since I had seen friends using it recreationally years before and had kind of assumed that any drug that had that much recreational appeal would have been identified as a poor choice as a treatment tool for people who are anxious and depressed, especially when other, non-addictive options are available! Anyway, I chose lexapro and it has worked very well -- I share my story because I was having pretty significant anxiety attacks -- waking up at night confused and screaming multiple nights a week -- and if your anxiety attacks were at this level or under it, I would say that your doctor made a pretty questionable choice to put you on both lexapro AND xanax. This is especially true if your doctor has had you taking xanax on a daily basis -- my doctor mentioned giving me the "happy" pills as something I could take if the anxiety started to come back despite the lexapro, so I could take it occasionally, and I told her no thanks, that I have an addictive personality and am better off without pills I saw my friends using years ago to keep them entertained between binge drinking bouts. Another friend of mine was offered the same choice and does have a mood altering pill she takes occasionally during high-stress periods. If your doctor suggested this way of approaching anxiety medication, then she or he was definitely in the treatment ballpark. If you started taking xanax on a daily basis instead of using it occasionally, to me that is very understandable and the exact reason why xanax seems like a poor "back up" for lexapro. But if your doctor TOLD you to take both lexapro and xanax on a daily basis, than either you had anxiety issues that were very serious -- maybe feeling so anxious you felt suicidal? -- or else the doctor did something that I would consider to be very questionable.
I don't know what the answers to any of these questions are, but they might be worth considering, especially because if you've only been using xanax occasionally, stopping should NOT be difficult -- that is why these drugs are usually prescribed as for use on an occasional basis -- it keeps dependency from setting in. On the other hand, if you went to a doctor with garden variety anxiety and not only did the doctor prescribe both xanax and lexapro to take on a daily basis right off the bat, without even trying lexapro alone with xanax as a backup, and is now trying to keep you ON xanax despite the fact that you are having trouble paying for it and fear that you are now dependent on it, then this doctor probably has WAY too close a relationship with his or her drug rep, and should be reported.
Good luck -- I'm very glad that the anxiety is now under control, and wish you all the best getting xanax free in a healthy way.
M.