I don't get more than 3 hrs. of sleep a night, due to chronic back pain I've had for about 23 years. I was prescribed mirtazapine Will it REALLY help my sleep? Mild depression & anxiety are a secondary side effect of my chronic physical problem, not a chemical imbalance, and I prefer not to gain weight, or feel "high". Doctors here prefer NOT to keep one on Vicodin, which was the ONLY med that helped me sleep correctly, and function at my best every day. Is this the correct med for me?