I have chronic anxiety, it is much worse than my spinal stenosis, I have had 15 years of relief after my anterior lamenectomy, this is a chronic condition that Ican deal with. I am on 30 mg. Morphine 2x daily. I have both knees that are both treated with orthovisc which is a dream, relieving all pain. The main problem is anxiety that Itake 2mg. Xanax ER 2mg. Every morning. I was taking 2 regular xanax every night to sleep. Insomnia seems to be the worst I am dealing with, is it a good idea to switch to ambian to sleep. I can. Go 48 hours without sleeping if I take nothing. This is continuous.