First off you are not failing miserably and you are not alone. You are just in a rut and you need to get out of it for your own health and safety. I have been where you are right now, as I am sure everyone else on here has at one point or another. It is very frustrating going through what you are going through. Life in general is hard, and if you throw in some diabetes it gets really complicated! The good thing is that tomorrow you get to start new. I know you are feeling horrible and you might think that staying high will be good in some ways. It may be in some sadistic way for a short while, but you want better than that for yourself.
I can assure you that if you start making some positive choices you will start to feel better, loose weight and your sugars will come down. Sit down and evaluate why your sugars are high. Are you doing what you should be doing or have you fallen into a slump and let some bad habits slip in? Or is it something out of your control? Once you figure it out start working on changing what needs to be changed.
Like Brenda said “We wouldn’t even need tudiabetes if all of this was so easy.”
It is not easy, but it does not have to control your life either. Take charge girl. I hope things turn around for you 
“To succeed you must first improve, to improve you must first practice, to practice you must first learn, and to learn you must first fail.” --Wesley Woo