Xanax can be difficult to get off. Could you ask your pdoc for a taper plan like halve the dose for 2 weeks and again for another 2 weeks and so on. Or switch to the equivalent dose of Valium and taper from there as its easier. It certainly isn't working for you but sleep is crucial so maybe a non benzo can help with that. I am trying to come of Clonazepam (Klonopin) right now and it is tough. Will stay away from benzo's once I do. Wish you all the best.